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Old 04-22-2008, 12:50 PM
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O/D auto for '91 GMC S15 2.5L 4 cyl?

Posted for a friend...

Anyone know if there is an automatic tranny (preferably with overdrive) that will fit a '91 GMC S15 2.5L 4 cyl engine? It now has a 5-speed overdrive and I would prefer auto.

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Old 04-22-2008, 01:00 PM
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Is that OBDI or OBDII a 200 r4 would be the best bet..try car-part.com for an auto trans and get a complete swap from a truck with an auto trans would be the best bet..

Hope this helps..

Sam
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Old 04-23-2008, 09:00 AM
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My friend says the bolt patterns of the Chevy 200R4 and the GMC 4-banger don't line up. Anybody know if the Jimmy uses the BOP pattern?
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Old 04-23-2008, 09:16 AM
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A lot of the 200r4trans are dual pattern chev and BOP..So it is the most likely one that will work for that..According to my interchange book that 1991 came with the 4.3 liter Six in it..Are you sure you have the correct year,,?? I have to go back to 1988 to show one of those with a 4 cyl in it..When I do that there are some options as some other cars show trans with OD available..My source is car-part.com


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Old 04-23-2008, 09:21 AM
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I can only go by what my bud is telling me. He is 200 miles away. He is a long-time car guy so I have to assume he knows what he's talking about. He bought the bombed-out S15 to use the running gear for a T-bucket he's building for his wife. He has built two other T-buckets that I'm aware of, plus several other hotrods over the years.

Thanks for the help.
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Old 04-23-2008, 10:04 AM
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I can come up with some likely culprits for a trans but he is going to have to make a trip to the yard to see if any of them actually will work for him..

Sorry I am 2000 miles from there..I looked for Kansas and found 2 trans available at A and A auto truck salvage in Wichita..Can anyone say road trip..?? Now I have not a clue as to these being what he wants but they are automatics for the 4 cyl according to the search..

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Old 04-23-2008, 10:38 AM
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Quote:
Originally Posted by XNTRCI-T
Posted for a friend...

Anyone know if there is an automatic tranny (preferably with overdrive) that will fit a '91 GMC S15 2.5L 4 cyl engine? It now has a 5-speed overdrive and I would prefer auto.
Only OD trans that will fit and work is a 700-R4 (4L60) and is very common in most years of S10/S15 trucks. 200-4R will not fit a 4 cylinder motor. 4L60-E will bolt in, but requires a computer connection and the 4 cylinder version is quite rare.

There are two other non-OD options.

One is a JUNK 200 3-speed out of an 82 S10.

Second is a Chrysler A904 (A998, A999) out of a 4cyl Jeep with a GM engine in it. Best part of this option is that you can install low ratio planetaries in it if it does not already have them. You would need to change the 4x4 tail and shaft to 2wd.

Last edited by mmerlinn; 04-23-2008 at 01:35 PM.
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Old 04-24-2008, 08:38 AM
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Does the 2.5L have the old V6 60Degree bellhousing pattern? I read somewhere some 700R4s have this pattern. If so thats why the 2004R wont work.
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Old 04-24-2008, 07:07 PM
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Quote:
Originally Posted by mmerlinn

Second is a Chrysler A904 (A998, A999) out of a 4cyl Jeep with a GM engine in it. Best part of this option is that you can install low ratio planetaries in it if it does not already have them. You would need to change the 4x4 tail and shaft to 2wd.

Depends on what year / model GM engine was used... photo of a common GM bell pattern on a 904 trans:

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Old 04-24-2008, 11:50 PM
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Crosley.

That is not the one I was referring to.

The one that I meant was the one with the "S10" bell, the same bell pattern that GM uses on most front wheel drive transaxles. I have two of those cores on the floor now and it is fairly common.

The one you show is very rare. I have not had one in years. I know it came in Concords and a few other cars, but don't know for sure whether it ever came in a Jeep.
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