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  #1  
Old April 9th, 2014, 06:22 AM
CDeWan
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Clay DeWan
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GM gen III

Ok currently traveling cross country with nick's Gen III conversion. I towing a 90 will post pics. I was able to accelerate up a 6% grade . Both trucks have roof racks. I don't think nick is going to market this set up as it uses a BW t case and custom drive lines whereas his gen IV uses the lt230.and stock drive lines. Let me apologize to nick as I did not want to take away from his gem IV post by I am grinning from ear to ear with this 5.3l under the hood. This is an awesome set up he did. More to come.
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  #2  
Old April 9th, 2014, 06:24 AM
CDeWan
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Sorry for the spelling errors as I am posting from my I phone
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  #3  
Old April 9th, 2014, 11:39 AM
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Did you leave the engine mounts fixed & move the transfer mounts or other way around.... or both. As I need new drive shafts anyway, would be interested in this swap over a 3.9/4.6 rebuild. Also don't want all of the electronics for the 6 speed, a simple stand alone 3 wire hook up engine loom would be nice

What sort of $ do you have into the conversion ?

How'd it fit with the LT230 ?

Did you use a custom rad or make the pipes fit the LR one ?

PS.... more pics please... Cheers !
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  #4  
Old April 9th, 2014, 12:42 PM
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55 mph at 1,100 rpms - not bad.
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I am talking purely from an aesthetics standpoint.
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  #5  
Old April 9th, 2014, 01:01 PM
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Quote:
Originally Posted by Landy_Andy View Post
Did you leave the engine mounts fixed & move the transfer mounts or other way around.... or both. As I need new drive shafts anyway, would be interested in this swap over a 3.9/4.6 rebuild. Also don't want all of the electronics for the 6 speed, a simple stand alone 3 wire hook up engine loom would be nice

What sort of $ do you have into the conversion ?

How'd it fit with the LT230 ?

Did you use a custom rad or make the pipes fit the LR one ?

PS.... more pics please... Cheers !
Andy,

The engine mounts here are bolt in. Just like the Gen IV. It has a LM7 (5.3L, 295HP) and 4L60e transmission (4 Speed). Coupled to a BorgWarner 1339 (Wagoneer T-case). It uses a Painless wiring harness with three wire hook up you are looking for.

Stock radiator.

I have another LM7 sitting here with a new Painless harness. No trans. If there is a real interest in the Gen III, I could try to something with the LT230. Probably have to move it back though. Might work with my new adapter and a different shaft.

Good thing about the Gen III is it's cheep. About half the cost of the Gen IV.

Nick
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  #6  
Old April 9th, 2014, 01:27 PM
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Sweet... would make a nice option for a trail orientated rig like mine. Don't really need the better gas economy or the 6 speed 'driveability' as it'll not really going to see much highway use and it keeps it simple. Don't know much (anything) about Wagoneer's... did they use any other type of trans case ?

Would a Toyota one fit ? Can then get cheap low range gear kits rather then the $$ for an Ashcroft crawler box then.

PM me the cost of the adapter pls, Nick.
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  #7  
Old April 9th, 2014, 03:18 PM
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The 6 speed does have much lower gearing than the 4 speed though, which is a consideration in the overall drivetrain for off road use.
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  #8  
Old April 9th, 2014, 04:51 PM
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Quote:
Originally Posted by rijosho View Post
55 mph at 1,100 rpms - not bad.
That is really pretty impressive.

I could see these kits being pretty popular - seems like a nice upgrade from the Rover 3.5 on the import rigs. If I am not mistaken the motor mounts can stay in? 295hp and a quick search shows motors in the $1,000 range. Not sure how much the kit costs but sounds like you could have an updated Chevy powerplant/drivetrain for under $5k all in. For the Hp that seems a lot cheaper than getting the same output from a Rover motor.

Very nice job Nick and CDwan
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  #9  
Old April 9th, 2014, 04:51 PM
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Quote:
Originally Posted by nmarkiw View Post
Good thing about the Gen III is it's cheep. About half the cost of the Gen IV.

This is what would sell it for me... have to take into account we only get 6mths of the year to use a trail truck here, rest of the time it's either sled or boarding.

------ Follow up post added April 9th, 2014 01:53 PM ------

Quote:
Originally Posted by don View Post
That is really pretty impressive.

I could see these kits being pretty popular - seems like a nice upgrade from the Rover 3.5 on the import rigs. If I am not mistaken the motor mounts can stay in? 295hp and a quick search shows motors in the $1,000 range. Not sure how much the kit costs but sounds like you could have an updated Chevy powerplant/drivetrain for under $5k all in. For the Hp that seems a lot cheaper than getting the same output from a Rover motor.

Very nice job Nick and CDwan

Throw into that it'd cost me ~$4K to rebuild a 3.9/4.6 hybrid.... makes even more sense and parts are available in town too !
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  #10  
Old April 9th, 2014, 05:16 PM
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5.3 is a great engine, hell id even take a 4.8 over this 3.9
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  #11  
Old April 9th, 2014, 05:31 PM
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Quote:
Originally Posted by Red90 View Post
The 6 speed does have much lower gearing than the 4 speed though, which is a consideration in the overall drivetrain for off road use.
4.027 1st versus 3.059, 32% lower.
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  #12  
Old April 9th, 2014, 06:02 PM
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Quote:
Originally Posted by rover4x4 View Post
5.3 is a great engine, hell id even take a 4.8 over this 3.9
I just did a search on LM7 problems and it didn't come up with all the much. Seems like if you do routine maintenance they can go 300k without much issue.

Landy Andy - I was going to add that you can get GM parts just down the corner practically. Maybe a little further up in BC but I am sure still not too bad.
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  #13  
Old April 9th, 2014, 07:04 PM
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Man so jelly..
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  #14  
Old April 9th, 2014, 07:31 PM
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Quote:
Originally Posted by Red90 View Post
4.027 1st versus 3.059, 32% lower.
But at say, half the cost of the gen IV install the savings would get you the Ashcroft crawler box...

------ Follow up post added April 9th, 2014 04:35 PM ------

Quote:
Originally Posted by nmarkiw View Post
If there is a real interest in the Gen III, I could try to something with the LT230. Probably have to move it back though. Might work with my new adapter and a different shaft.


I think this is deff the way to go, reading on some of the Jeep forums the BW 1339 is getting hard to find these days and rebuild kits are thin on the ground too. Other option would be to use a 3rd party transfer box but then your getting away from the 'budget' conversion that makes this so tempting....
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  #15  
Old April 9th, 2014, 11:06 PM
CDeWan
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I glad to see discussions about these power plants. They are not for the puriest. My nas already had 360k on the clock so it was no garage queen, just my DD.
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  #16  
Old April 9th, 2014, 11:29 PM
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Quote:
Originally Posted by CDeWan View Post
I glad to see discussions about these power plants. They are not for the puriest. My nas already had 360k on the clock so it was no garage queen, just my DD.
Taken from Wikipedia:

Quote:
The LS series was a "clean sheet" design with little in common in terms of shared parts with the classic Chevrolet small block V8. The basic layout owes a good deal to the essential concept of Ed Cole's original small-block design of 1954-55, though the LS engine also uses design cues from Buick, Oldsmobile, and Pontiac engines.
Yes, not a pure Rover engine and maybe not immediate family but could be a distant cousin.
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  #17  
Old April 10th, 2014, 03:22 PM
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Quote:
Originally Posted by Landy_Andy View Post
Sweet... would make a nice option for a trail orientated rig like mine. Don't really need the better gas economy or the 6 speed 'driveability' as it'll not really going to see much highway use and it keeps it simple. Don't know much (anything) about Wagoneer's... did they use any other type of trans case ?

Would a Toyota one fit ? Can then get cheap low range gear kits rather then the $$ for an Ashcroft crawler box then.

PM me the cost of the adapter pls, Nick.
Novak has an adapter from this 4L60/65E to a Dana 18. That would get you drop-right and offset rear drive line. Like the LT230. TeraFlex has low range kits for the Dana 18 (teralow). Part time 4wd though.

Not sure which Yota t-case to use. Some had chain drive, some had offset rear drive line.
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  #18  
Old April 10th, 2014, 03:37 PM
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Quote:
Originally Posted by nmarkiw View Post
Novak has an adapter from this 4L60/65E to a Dana 18. That would get you drop-right and offset rear drive line. Like the LT230. TeraFlex has low range kits for the Dana 18 (teralow). Part time 4wd though.

Not sure which Yota t-case to use. Some had chain drive, some had offset rear drive line.
http://www.advanceadapters.com/tech-vault/dana-18/
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  #19  
Old April 11th, 2014, 01:05 PM
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Quote:
Originally Posted by nmarkiw View Post
Novak has an adapter from this 4L60/65E to a Dana 18. That would get you drop-right and offset rear drive line. Like the LT230. TeraFlex has low range kits for the Dana 18 (teralow). Part time 4wd though.

Not sure which Yota t-case to use. Some had chain drive, some had offset rear drive line.
That Dana 18 is an old unit, can see spares becoming rare & expensive.... if you come away from the pass side drop then the Dana 300 would would work, lots out there, lots of H/D upgrades and you can twin stick it but then you might as well build a set of 9" axles to go with it too.

Sort of gets away from the budget install then.... but would give you strong axles and the option of rear 2wd for street use. I could see overall cost similar to the 6 speed install then.
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  #20  
Old April 11th, 2014, 03:51 PM
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Quote:
Originally Posted by Landy_Andy View Post
That Dana 18 is an old unit, can see spares becoming rare & expensive.... if you come away from the pass side drop then the Dana 300 would would work, lots out there, lots of H/D upgrades and you can twin stick it but then you might as well build a set of 9" axles to go with it too.

Sort of gets away from the budget install then.... but would give you strong axles and the option of rear 2wd for street use. I could see overall cost similar to the 6 speed install then.
I agree on the obsolete transfer cases. You can use a Stak or Altas. Then you would need a rear axle and $3000 t-case. $$

I have a 4L60E transmission case arriving next week. I will mock it up in the mule frame next weekend. See if I can get it to clear the the front drive line.

If your interested in the NV4500, I am pretty sure that will bolt up to my LT230 adapter and use all the brackets from my Gen IV project. (Gen III LS, NV4500 4x4 trans, LT230) This would keep the LT230 is the stock location.
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