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Unread 09-17-2011, 10:29 PM   #1
PlaneJob
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Will a T-90 Bolt up to a AMC 232 I-6?

I have a Jeep DJ with an AMC 232. I'm considering putting a manual transmission into the Jeep and was wondering if a T-90 would bolt up?

Currently I have a BorgWarner t-35.

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Unread 09-18-2011, 01:06 AM   #2
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Yes if you have the right bellhousing and the later version. There are 2 or 3 variants of it. The early ones before 60 something i think, and the ones behind 4 cylinders have a shorter input shaft and won't work with a 6 cyl. I have both versions and the shorter (4 cyl) is 7" input stickout and the longer (6 cyl) is 9 1/4". Also you have to figure in the fact that the t90 only bolts to a spicer 18. In order to get a Dana 20 to mate you need a adapter. AA makes one I think and I know Novak does. And in case you didn't know the Spicer 18 has the front and rear outputs on the passenger side so a rear axle with a passenger pumpkin is required. My 71 scout 800b had a amc 232 with a t90. I swapped in a 258 though. Unless you have the correct trans and bellhousing is will probably not be the best swap due to not being that strong and needing adapters for the Dana 20.

If you want a 3 spd the t15 is the best. And they don't sell for to much. The t150 ain't bad either but its still not as good as the t15. The t90 and t150 both have unsynchronized first gears whereas the t15 is fully synchronized. I've had all three and the t15 is definitely the best for the money.
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Unread 09-18-2011, 07:15 AM   #3
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Thanks for the education!

Currently my rear axle (Dana 44, limited slip) has a centered differential - would a Dana 20 t-case allow me to keep that?

What kind of transmissions would you recommend for keeping it simple but going to 4wd? It currently has an automatic (BW T-35, 3 speed). I am shying away from auto because I've been told they are too long, does this ring true?

I guess staying auto would be cool, too, but I thought I needed to switch to manual to get short enough.
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Unread 09-18-2011, 07:34 AM   #4
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Auto would be fine but I think one strong enough runs more money than a well planned conversion. With your engine there are many possibilities especially if you don't go over board on the tires. You could use a T-4 or T-5 which are plentiful and bolt directly to a Dana 300 which is extremely durable. Although probably more money a T-150/176 with a 300 would be the shortest. Your best bet is to find a donor vehicle that way you have everything, little stuff can nickel and dime you to death.
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Unread 09-18-2011, 09:34 AM   #5
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Depending on what year T90 or D20 and depending on it's it's original application, a D20 may bolt up to a T90 originally used with a D18. They share the same basic Texas bolt pattern but there may be differences in the T/C bearing bore which locates the T/C on the transmission. In fact, D18s and D20's share the same basic housing.
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Unread 09-18-2011, 11:05 AM   #6
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What kind of vehicles had T-4s or T-5s and Dana 300s?
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Unread 09-18-2011, 11:49 AM   #7
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T15 and Dana 20 from the 70s is your best bet
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Unread 09-18-2011, 11:59 AM   #8
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Quote:
Originally Posted by levergun View Post
If you want a 3 spd the t15 is the best. And they don't sell for to much. The t150 ain't bad either but its still not as good as the t15. The t90 and t150 both have unsynchronized first gears whereas the t15 is fully synchronized. I've had all three and the t15 is definitely the best for the money.
T-150's have synchronized first gear. T-15's are the strongest of the Jeep 3 speeds but certain parts may be difficult to come by these days.
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Unread 09-18-2011, 12:02 PM   #9
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Quote:
Originally Posted by Forrestking View Post
What kind of vehicles had T-4s or T-5s and Dana 300s?
Jeep CJ's from about 83 through 86.
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Unread 09-18-2011, 05:48 PM   #10
levergun
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Yes the spicer 18 and d20 have the same texas bolt pattern. The issue is the 18 has a smaller tc bearing support. The d20 is bigger. They are not interchangeable without a adapter. Also the output gears are on the trans are slightly different. According to novaks site there was a large output t90 in the j trucks from 62-65.

I have 3 t-15 and 2 t-90s and a t-86. The t15 is undoubtedly the strongest. Also, I have no experience with the t-150 but according to Novak and several other websites it is unsynchronised first gear. The t90s are cool but the spur cut unsynchronized first gear gets old fast. Pretty much like trying to shift into reverse every time you go to first gear. The t-86 is slightly better but neither holds a candle to the t-15.

For the money though I would look for a t150/20 combo or maybe a t18... Although at this point you could even go ax15/231 if you wanted. Do you have a front axle yet?
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Unread 09-18-2011, 06:43 PM   #11
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T 150 is synchronized first and is a decent transmission that can hold up to v8 power. The d18 and d20 differ in rear outputs as the d18 has offset therefore needing offset rear axle. D20 in stock form sucks on low range gearing too but there are kits for this. I had a t90 and hated it. First gear sucks and I will never own another like that.
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Unread 09-18-2011, 06:49 PM   #12
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Quote:
Originally Posted by levergun View Post
Yes the spicer 18 and d20 have the same texas bolt pattern. The issue is the 18 has a smaller tc bearing support. The d20 is bigger. They are not interchangeable without a adapter.
D18 T/C's from about 67 on up have the big hole case or you could find a bearing adapter from an earlier T-90. There are ways to make it work as I said in my earlier post.
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