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  #21  
Old June 29th, 2015, 12:05 AM
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John B.
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Just checked. That is revving very high. You can't have stock gearing.

First check the transfer case serial number.
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  #22  
Old June 29th, 2015, 07:15 AM
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I'm running 4:11's with 33's and stock speedo 70mph = 2500rpm. 33's throws the speedo off about 8-10mph if I recall correctly.
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  #23  
Old June 29th, 2015, 07:03 PM
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Charles Galpin
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Don't forget the more likely diffs!
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  #24  
Old June 29th, 2015, 07:13 PM
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Red90 - thanks for all your help on this! i still need to investigate the serial # on the Tcase. are you suggesting i get the serial # simply to help me quickly identity the specific Tcase that is in the vehicle?

1of40 - thanks for the point of reference on RPMs. that's a big difference from what i'm running. yikes!

Charles - you're spot on. the diffs will be examined. looks like i have my first project on my hands. in a sick way i'm kind of excited about it. that feeling might wear off once i start buying parts...
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  #25  
Old June 29th, 2015, 07:17 PM
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My 94 with the 5-sp, stock gearing and warn 255/85 KM2 (say 32.5") runs 2050 RPM at 60 mph (GPS). Indicated is - hair over 55 mph.

------ Follow up post added June 29th, 2015 07:22 PM ------

Quote:
Originally Posted by 1of40 View Post
please sir, go on...
My PO had this issue that limited the RPMs at 3400. Took a while to sort out (and most every electronic part was replaced before identifying the split on the air hose that opened when the vacuum was high and leaned out the motor). Thinking it was Pendy that made the suggestion on where to look. It is all documented on the threads around ~05'.
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  #26  
Old June 30th, 2015, 12:35 PM
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Quote:
Originally Posted by ionfender View Post
Red90 - thanks for all your help on this! i still need to investigate the serial # on the Tcase. are you suggesting i get the serial # simply to help me quickly identity the specific Tcase that is in the vehicle? 1of40 - thanks for the point of reference on RPMs. that's a big difference from what i'm running. yikes! Charles - you're spot on. the diffs will be examined. looks like i have my first project on my hands. in a sick way i'm kind of excited about it. that feeling might wear off once i start buying parts...
You might know this but if you want to check what your gearing is in the Diffs you can spin one wheel one full rev and count how many times the drive shaft turns. 3.5:1 is stock.
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  #27  
Old June 30th, 2015, 12:44 PM
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Quote:
Originally Posted by 1of40 View Post
You might know this but if you want to check what your gearing is in the Diffs you can spin one wheel one full rev and count how many times the drive shaft turns. 3.5:1 is stock.
You would need to spin both wheels together at the same time. Spinning one wheel won't work.

Based on his figures, he can't have 3.54s. With 3200 @ 70 mph, he has either 4.1s and a 1.4 t. case or 4.75s and a 1.2 t. case

Ashcroft Transmissions - Ratio Calculator
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  #28  
Old June 30th, 2015, 09:35 PM
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Hi Josh - There seem to be some strong opinions (you and others) about the amount of lift on Defenders. I'm also not crazy about the amount of lift on the truck I bought, but it wasn't a deal breaker because there are a lot of other things I liked about it. Curious what your thoughts are on an appropriate/acceptable amount of lift (I'm not going to be a heavy/hardcore off roader). Seems like 2" is popular?


Wait is this about the truck with the 4" lift?

------ Follow up post added June 30th, 2015 08:37 PM ------

down_shift - do you know what transfer case you have in your 94?


Quote:
Originally Posted by down_shift View Post
My 94 with the 5-sp, stock gearing and warn 255/85 KM2 (say 32.5") runs 2050 RPM at 60 mph (GPS). Indicated is - hair over 55 mph.

------ Follow up post added June 29th, 2015 07:22 PM ------


My PO had this issue that limited the RPMs at 3400. Took a while to sort out (and most every electronic part was replaced before identifying the split on the air hose that opened when the vacuum was high and leaned out the motor). Thinking it was Pendy that made the suggestion on where to look. It is all documented on the threads around ~05'.
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  #29  
Old June 30th, 2015, 10:53 PM
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maybe the wrong pulley on the alternator. ive always thought the rev counter was a little generous on my homies LWB, my RRC tach reads slow. i highly doubt someone would go to the effort to regear a "stock" 90.
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  #30  
Old July 1st, 2015, 10:23 AM
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It might be worth running the t-box #'s. I replaced @ least 25 t-boxes under warranty back in the 90's because of noise issues. The truth was most of the 94 D90's came factory with 1.4 t-boxes and were replaced with 1.2 to get rid of the whine and higher revving you got from the straight cut gears of the 1.4's. It would be hard to believe that this 90 has slipped through the cracks all these years and it never got replaced with the 1.2 box but I guess if no one complained about the noise then it wouldn't be addressed.
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  #31  
Old July 1st, 2015, 10:43 AM
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Quote:
Originally Posted by ionfender View Post
down_shift - do you know what transfer case you have in your 94?
Don't know, but it must be the 1:211 given my results are spot on with Ashcroft's ratio calculator:
High Table Speed/Gear First Second Third Fourth Fifth
10 MPH 1638 946 620 444 342
20 MPH 3276 1892 1239 887 683
30 MPH 4913 2837 1859 1331 1025
40 MPH 6551 3783 2479 1774 1366
50 MPH 8189 4729 3099 2218 1708
60 MPH 9827 5675 3718 2662 2049
70 MPH 11465 6620 4338 3105 2391
80 MPH 13102 7566 4958 3549 2733
90 MPH 14740 8512 5577 3992 3074

For springs/shocks, if wanting to keep the drivetrain stock (well, except for the 4.xx diff gearing you clearly have), the medium OME/Bilstein setup is the way to go. About a 1.5" lift, progressive springs, quality shocks, and great all around drive. Smooth at all speeds and driving situations. Your existing 285/75 rubber will still clear the tubs (as they would with stock springs...).
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  #32  
Old July 1st, 2015, 11:39 AM
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Quote:
Originally Posted by ionfender View Post
Hi Josh - There seem to be some strong opinions (you and others) about the amount of lift on Defenders. I'm also not crazy about the amount of lift on the truck I bought, but it wasn't a deal breaker because there are a lot of other things I liked about it. Curious what your thoughts are on an appropriate/acceptable amount of lift (I'm not going to be a heavy/hardcore off roader). Seems like 2" is popular? Wait is this about the truck with the 4" lift? ------ Follow up post added June 30th, 2015 08:37 PM ------ down_shift - do you know what transfer case you have in your 94?
Ion, most people that put lifts in defenders go 1.5 to 2".... Little to no drivetrain problems occur... 3" is common with folks that want to clear a bit of a larger tire under full articulation (285/55/16s barely rub in the rear under full articulation with a 2" lift) or have setup their suspension for more travel. At 3" driveline issues warranting different drive shafts etc may occur but not for everyone.... Anything greater than that is extreme and is usually frowned upon for these vehicles which are very capable stock... (No offence to those who run those lifts as a few of you actually have very well setup vehicles [wolf, brooks])Often those who put 3" and especially those that do more change other things around as well like diff gearing. By identifying the amount of lift you can make a better guess as to where possible issues lie.
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  #33  
Old July 1st, 2015, 11:44 AM
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Quote:
Originally Posted by rover4x4 View Post
maybe the wrong pulley on the alternator. ive always thought the rev counter was a little generous on my homies LWB, my RRC tach reads slow. i highly doubt someone would go to the effort to regear a "stock" 90.
Would be a good idea to pick up a laser tach (they are cheap) and check the tach reading.
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  #34  
Old July 1st, 2015, 03:09 PM
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Roverchef & Red90 - You seem to be well versed with tranfer cases. I have the serial #. Is there a source where I can verify which Tcase it is based on the serial #?
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  #35  
Old July 1st, 2015, 03:14 PM
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Quote:
Originally Posted by ionfender View Post
Roverchef & Red90 - You seem to be well versed with tranfer cases. I have the serial #. Is there a source where I can verify which Tcase it is based on the serial #?
Ashcroft Transmissions
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  #36  
Old July 1st, 2015, 03:32 PM
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Thanks Zack! Looks like it is 1.222
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  #37  
Old July 1st, 2015, 05:30 PM
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Then you either have a tach that is wrong or 4.75 R&Ps.
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  #38  
Old July 1st, 2015, 05:38 PM
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Quote:
Originally Posted by Red90 View Post
Then you either have a tach that is wrong or 4.75 R&Ps.
He did buy a 90 that had a 4" lift, perhaps it had 35s or something on it before he got it.


Time to test the diffs!
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  #39  
Old July 1st, 2015, 07:37 PM
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Quote:
Originally Posted by Z.G View Post
He did buy a 90 that had a 4" lift, perhaps it had 35s or something on it before he got it.


Time to test the diffs!
Great idea

For options to verify the tach (and a host of there things), you might want to search for rover gauge here and on the inter webs.
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  #40  
Old July 1st, 2015, 09:51 PM
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Guys - Great work diagnosing this from afar. I very much appreciate the help!!! Based on the quick and dirty wheel spin test you are dead on (particularly Red90). It has 4.75 in the diffs. Spins out to be exact. Now to get them swapped out...
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