Trans and t case options for 300tdi - Defender Source
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  #1  
Old November 8th, 2010, 10:18 AM
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Paul D
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Trans and t case options for 300tdi

Hi there everyone....
I am wondering if anyone has an opinion on the following trans and t case options that will be best suited for my 90. Listed below are my options. I run 33" tires and have 3.54 r&p.

1. V8 r380 with 1.2 v8 lt230
2. 300 r380 with 1.2 lt230
3. 300 r380 with 1.4 lt230 and roverdrive overdrive
4. V8 r380 with 1.6 lt230 and roverdrive overdrive
5. 300 r380 with 1.6 lt230 and roverdrive overdrive

Driving plans with the 90 are mostly around town, moderate wheeling, and a couple road trips a year. Moderate towing might also fall in there if need be. I also want to be able to cruz at hyw speeds and be quick around town....


Thanks in advance,
Paul
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  #2  
Old November 8th, 2010, 10:59 AM
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Doug Crowther
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Given you are in Colorado-#3 without the roverdrive. Truck will easily do 70-75 no need for an overdrive.
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  #3  
Old November 8th, 2010, 11:00 AM
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Jim Cheney
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You understand that a v8 r380 has the wrong length input shaft for a 300 tdi right?
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  #4  
Old November 8th, 2010, 11:01 AM
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Quote:
Originally Posted by JimC View Post
You understand that a v8 r380 has the wrong length input shaft for a 300 tdi right?
yes input shaft would have to be changed.
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  #5  
Old November 8th, 2010, 11:06 AM
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Quote:
Originally Posted by 130Tdi View Post
Given you are in Colorado-#3 without the roverdrive. Truck will easily do 70-75 no need for an overdrive.
Yes, that is what came with the engine.... Just bring in the gearboxes that are with the engine and don't reinvent the wheel....
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  #6  
Old November 8th, 2010, 01:18 PM
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I'm running 33's with a 300tdi. Pretty happy with the correct r380 and the 1.4 t-box. I can reach 80mph if I want to. 65-75 is a happier range for both me and the truck though. You can always add the roverdrive or swap traansfer cases later if you really don't like it. I think you will be lugging the engine on hills alot if you go with higher gearing.

Quote:
Originally Posted by dogbite View Post
Hi there everyone....
I am wondering if anyone has an opinion on the following trans and t case options that will be best suited for my 90. Listed below are my options. I run 33" tires and have 3.54 r&p.

1. V8 r380 with 1.2 v8 lt230
2. 300 r380 with 1.2 lt230
3. 300 r380 with 1.4 lt230 and roverdrive overdrive
4. V8 r380 with 1.6 lt230 and roverdrive overdrive
5. 300 r380 with 1.6 lt230 and roverdrive overdrive

Driving plans with the 90 are mostly around town, moderate wheeling, and a couple road trips a year. Moderate towing might also fall in there if need be. I also want to be able to cruz at hyw speeds and be quick around town....


Thanks in advance,
Paul
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  #7  
Old November 8th, 2010, 01:19 PM
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Paul D
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Ya I know the v8 input shaft is to long for the 300 but can be changed....

Does the roverdrive reduce the final gearing by an additional 17% or I am just making that number up? If so it seems that option 5 would be the best fit for power and speed? The t-case might get hot at hwy speeds for long distances but nothing a temp gauge to control myself wouldn't fix.

One more question.....did most or all the diesel 90's in England come with 1.4 t-cases? I have one from a diesel 90 but the Serial number indicates it's a 1.2?

Thanks again,
Paul
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  #8  
Old November 8th, 2010, 02:58 PM
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There is no reason to ever go 1.6. All 90s came with 1.4. It is important to not think of a gasser. The diesels behave differently....

The Roverdrive is 28% change in gearing....
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  #9  
Old November 8th, 2010, 07:10 PM
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I've got a 4.6, R380 and 1.4 Tcase in one 110. It cruises comfortably at 80 and taking on hills in 5th isn't a problem. 75mpg = 3,000 RPM though and sometimes I think it would be nice to drop that to 2,500 RPM with a 1.2, but it sure is nice not having to downshift all the time.

I've also got a 200Tdi, LT77 and 1.2 Tcase in a 110 HCPU. It performs similarly. I like keeping the RPMs low on the diesel and the extra torque seems to keep me from having to downshift at all.
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  #10  
Old November 8th, 2010, 07:58 PM
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Wow.... 75 mpg
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  #11  
Old November 10th, 2010, 02:34 PM
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Keith Kreutzer
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Gimmie a call, you can come drive my 110 300tdi, 1.4 t case, r380, 4.10 gears and Rover drive (its a fine set up!).
Or you can drive the 90 with 300 1.4 and 3.54.
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  #12  
Old November 10th, 2010, 02:44 PM
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Andrew J. Hutton
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My new 1.2 (q) case is sitting in a crate waiting to get.swapped.in when this cold/flu finally goes away. Will let you know how I.feel about it by next week.
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  #13  
Old November 10th, 2010, 03:04 PM
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Keith Kreutzer
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Final drive ratio's
1.2x3.54 = 4.248:1
1.4x3.54 = 4.956:1
1.6x3.54 = 5.664:1
1.4x4.11 = 5.754:1
1.4x4.11x.72 (OD) = 4.142:1
I'm about 1:1 in OD which is nice on the highway and on the flat 1st gear isn't a clutch killer but it is on a hill so I don't use OD in town so much. Of course my fuel is turned up and I have the "Super Turbo" so the truck has a lot of balls.
I run 32's on this truck.
The next one will be 4.88's and a 1.2 box on 37's perhaps the new Rover/underdrive product if Ry get's it out in time.
The nice thing about the 4.11 gears is that I'm also 17% lower in low range which really helps drivability in the tough stuff off road... It could be lower though.
The tranny I have for the next truck has the Maxi drive 4.5:1 low range gears, very nice!
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