TH400 to engine adapter?

no
it used an adapter
according to the parts book

 

I have 2 FSJ with th400/QT They both have AMC bolt pat. not bop

 

Try this Jeepster Commando site http://jeepstercommandoclub.com/forum/index.php

IIRC - I thought the turbo 400 just bolted to the Buick Engines, and the 400 trans for the AMC engines had a different bellhousing bolt pattern. Might make a neat swap, use the guts from the QT into a Jeepster TH 400.

 

offset of flexplate ?
not enough room for torque converter, had to space it back ?
I don't make the Jeep rules
just try to decipher them...

 

dang it
don't have my Jeepster FSM anynore.....

 

oh Sparky....
Buick 350 in FSJ used the same adapter.....

 

Ok, as I understand it, all the Jeep TH400s prior to about 1973 used a NAILHEAD Buick transmission with an adapter. There are adapter rings for AMC 327, early 232, BOP (225 and 350) and the late AMC pattern (258, 304, 360), all different. In around 1973 AMC started using a TH400 with a dedicated AMC case - which fit all the available engines at that time, and continued through 1979 (the last of the Jeep TH400).

BTW the NAILHEAD case is shorter than the other TH400 cases becasue the NAILHEAD Buick block sticks out about 3" to meet the transmission bellhousing. Thus there is room for the various adapter rings.

 

FSJ with the 350 Buick used the same tranny that was used in the Jeepster and would have used the adapter. If you've seen one with the BOP bolt pattern it's quite likely it's been changed over because they couldn't find one with the correct bolt pattern.
The bolt pattern used on the Jeepsters, from what I understand, is so these trannies could also be used in non GM vehicle lines. Does seem rather strange considering the Jeepster and the FSJ's both used Buick engines but I believe it had something to do with licensing or something. I believe old Jags with automatics used the same bolt pattern on the tranny just a different adapter and there were a couple of others that also used the 400. It would have been cheaper for Kaiser to use these somewhat generic cases rather than the BOP cases . I'm not 100% sure this information is correct, I think I heard it from an ex brother-in-laws friend of a friends father-in-laws brothers uncle on his wifes side .
I read the post above after I posted this and yes, it was the Nailhead. But they also used them in non GM as well. Maybe GM had a pile of trannies left over from the Nailhead days?

 

"I'm not 100% sure this information is correct, I think I heard it from an ex brother-in-laws friend of a friends father-in-laws brothers uncle on his wifes side ."

hey, that was my excuse...

 

No problem - it's correct to the best of my knowledge. I know that the '71 FSJs used the AMC engines and an adapter ring, and I'm pretty sure the adapter rings lapped over into '72. This lag could be because AMC needed to use up the existing TH400s, or that it took time to tool up an AMC case, or something. I don't think that the NAILHEAD case was intended as a universal case, but that it just worked out that way because of the characteristics of the NAILHEAD Buick block.

 

Actually, my 73 has the adapter ring also. Can't remember what the build date was on it though, may be it's an early 73.

 

My 68 had the adapter ring. I had run across the information Tim had somewhere but can't put my hands on it. Might be on the Buick page.

 

The TH400 case was an amc pattern and used an adapter plate for the 225 v-6 to obtain the BOP pattern....

This same combo bolted up to a 1985 231.........

and after an internal case failure........ took the internals from the AMC th400 case and placed in a BOP case, which bolted right up to the 231.... and can see no reason the BOP case would not bolt up to the 225....



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