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T90C or not to T90C? That is the question. |
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Lee MN 
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Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4950 |
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 Posted: 09 Oct. 2015 at 6:11pm |
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Dads Jeep will run very nice down the road at 50 mph, 55 is pushing it, 60 is doable but unpractical, as jpet said the throttle is pinned.... This is at 800-900 ft. Above sea level, in Colorado around Nathrop (6000 plus) 50 is all it will do.
Lee 
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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jpet
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Posted: 09 Oct. 2015 at 6:22pm |
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I agree. For me 50 is the sweet spot for top speed
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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pjensen641
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Joined: 21 June 2014 Location: United States Status: Offline Points: 690 |
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Posted: 13 Oct. 2015 at 4:50pm |
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The previous gear charts weren't quite complete because I neglected to post a T90C with 25% OD. Per request, here they are. Again, this is with 600X16 (~28") tires.
 And in standard 2.46:1 Low range....  |
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smfulle
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Posted: 13 Oct. 2015 at 6:16pm |
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Thanks again for the charts!!
How about T90C, Tera-Low t/case, and 25% overdrive? I'm sitting here with my finger on the trigger of this combo, because I am excited about the low 1st gear crawl speed, but once again my math weakness blocks me from understanding the gear splits.
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Lee MN
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Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4950 |
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Posted: 13 Oct. 2015 at 11:51pm |
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Well, you can go to Novacs they have a conversion chart for math challenged people like myself!
The other way to look at it is your last combo is the dream combo, the only way it gets better, is a deep first gear 4 speed, and a more powerful engine and you do not want either, LOL. Lee http://www.novak-adapt.com/knowledge/gearing/ Edited by Lee (MN) - 14 Oct. 2015 at 1:50am |
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LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
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RustyAutoholicGuy
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Joined: 04 Apr. 2016 Location: NC/VA Status: Offline Points: 118 |
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Posted: 18 May 2016 at 7:31pm |
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Hey pjensen641 Did you make these graphs in Excel or some other spreadsheet application? I was wondering if I could get the formula you are using to make those graphs? I know this is an older post, but I'm doing a Kubota Diesel Swap and I'm wanting to figure out my cruising RPMs will be with a variety of different drivetrain combo's I'm looking into currently along with different lifts and tire sizes. The graphs are amazing for seeing what the splits are, I can see how the T90A and the 25% overdrive work so much better together but I would like to play around with tire sizes and axle gearing as well! Thanks DJG
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Mike S
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Posted: 18 May 2016 at 10:29pm |
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Stan
When rebuilding I found that I needed to replace gears in my T90. I simply bought the T90C input and cluster gears from Herm and installed in my existing T90 case. Voila! T90C. |
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'47 CJ2A -- #114542
Warn FF D41 rear Lock-Right locker 11" drum brakes Dual master cylinder T90C Transmission 16 X 6 Jeep truck wheels Cooper STT Pro tires |
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Oilleaker1
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Joined: 06 Sep. 2011 Location: Black Hills, SD Status: Offline Points: 4412 |
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Posted: 18 May 2016 at 10:37pm |
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This is a Oct 2015 thread.
I would add that I have one T90C and it's noticeably wierd compared to a T90 A. 1st/2nd is lower, and then a big jump up from 2nd to 3rd. On the flat it's not a problem. Pulling a steeper grade it's extremely noticeable. Now enter a overdrive. I think it would be perfect with a high range 2nd. Others say it is. So, I will most likely add it to my Jeep when the funds appear!  John
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Green Disease, Jeeps, Old Iron!
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pjensen641
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Posted: 18 May 2016 at 10:47pm |
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I'm away from home right now....but yeah. The C gears make the 2nd to 3rd a bit of an issue. You basically have to run flat out in 2nd and then you are just off idle shifting to 3rd. Without the OD, I think I would get annoyed with that. The OD makes it tolerable. If you don't need a low gear for off-road...you may want to skip the C gears.
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smfulle
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Posted: 18 May 2016 at 11:04pm |
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I pointed Dieseljeepguy47 to this thread when he asked for some data on gearing. People were very helpful to me when I was looking for a lower crawl speed. I went with the t90c and the Tera low geared d18 transfer case along with the 25% overdrive. I love it! I only have trouble from 2nd to 3D when running in overdrive and then only when I'm just starting out and everything is not up to operating temp. Walked me might up Wipe Out Hill in Moab. https://youtu.be/S89u30vfHVc Edited by smfulle - 18 May 2016 at 11:06pm |
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RustyAutoholicGuy
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Posted: 19 May 2016 at 2:45am |
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Yeah I knew I was going to be bumping an old thread, but it just had too much good information in it, but I still wanted more!
Again thank you smfulle! This thread has been a MASSIVE help, the graphs really do show the differences for the T90A vs T90C with 25% vs 30% overdrive!
Awesome! I can't wait to get the formula! Like I said I'm trying to build an ideal daily driver that can cruise at a good RPM at 55mph!!! Thank you so much everyone! DJG
Edited by DieselJeepGuy47 - 19 May 2016 at 2:47am |
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masscj2a
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Posted: 05 June 2016 at 7:10pm |
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I went T-15 into a Dana 20, twin stick with Terra Low kit and a Saturn overdrive into 427 gears on diffs. But I also running a 4.3 vortec.
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1946 CJ2a Dauntless aka Jalopy
1946 VEC stock 1981 CJ-8 5.3 LS 1966 CJ-6 SBC TUX 1968 CJ-6 225 V6 1974 CJ-6 4.2 1967 M-416 East Coast Modified CJ's |
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dasophoto
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Joined: 26 Mar. 2019 Location: Austin, TX Status: Offline Points: 3 |
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Posted: 27 Mar. 2019 at 1:33pm |
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I read somewhere on the internet that you could just replace the input shaft and change the first gear of a t90a to a t90c. I believe the input shaft is changed to a 16tooth and the first gear is a 35 tooth that matches. Anybody tried this?
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Beat up CJ3A
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smfulle
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Posted: 27 Mar. 2019 at 1:54pm |
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i'm pretty sure that is true. The trick is finding those parts. I bought my t90c complete from Herm the Overdrive guy., You might call him. He will know what you can and can't do and MIGHT sell you the parts if you want to do it yourself. |
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Oilleaker1
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Posted: 27 Mar. 2019 at 2:01pm |
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3rd gear or input shaft main drive gear, same thing, needs a cluster gear to match. 1st reverse are the same in a t90a or t90c. 2nd gear is different also between the two. The jump from 2nd to 3rd is too much on a hill with the t90c unless you have overdrive.
I have Jeeps equipped both ways. Also ww2 4:88 geared rigs. The overdrive with a T90 C is the best of both worlds and with Terrace Flex gears in the transfercase, more so. Then, 11 inch brakes all around and you are set.
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Green Disease, Jeeps, Old Iron!
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Oilleaker1
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Posted: 27 Mar. 2019 at 2:04pm |
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Green Disease, Jeeps, Old Iron!
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dasophoto
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Posted: 27 Mar. 2019 at 2:05pm |
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That sounds like a great setup! Im pretty cash strapped and was hoping I could just change some gears out but I might be able to find a t90c for about what I would pay for the regearing. Thanks!
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Beat up CJ3A
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Oilleaker1
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Posted: 27 Mar. 2019 at 2:06pm |
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I hate posting with a phone. What I forgot to say is if Stan or Jpet tell you to come along with them, put your big boy pants on. Maybe a welder and full set of extra parts too,
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Green Disease, Jeeps, Old Iron!
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pjensen641 wrote:
