TGREESE,tgreese wrote: ↑Thu Mar 11, 2021 12:42 pm Does not get a lot easier going earlier.
'79 or earlier Wagoneer or J-truck will have the same transmission and transfer case within the same years mostly. Very nearly all of the '74-79s will have a GM TH400 with the AMC case, and the Quadratrac (Borg-Warner 1339) full-time transfer case.
Thanks. I was asking if my 1979 J10 4x4 with a 4 Speed manual has the same transfer case (Quadratrac) in it already or if I would be required to get the transfer case from the automatic donor as well.
A Quadratrac is not compatible with a manual transmission - it cannot withstand the impact load. All manual transmissions in 1979 got the Dana 20 geared transfer case. You would know this if you read the factory service manual, free to read and download here. https://oljeep.com/edge_parts_man.html
Thanks! My wife found the truck and she can't drive stick and mainly want's it for easy, chill rides down to old town, etc. So you basically need everything between the front and rear axles, and everything up to the engine block, plus a new pilot bearing. OK. Why the new pilot bearing? Flywheel too? Sorry. I have done these swaps in both directions on many mustangs, miata's, etc with no drama.Stuka wrote: ↑Thu Mar 11, 2021 1:34 pm You can also use a floor shifter with the auto.
As tgreese mentions, you have to pull the transmission (TH400) apart in order to change out the output shaft to work with a D20, as well as buying the adapter. OEM adapters were very brittle and often cracked, and were only available for a few years. 74-79 was Quadra-Trac only behind automatics.
Also you have to change the pilot bushing out on the back of the crank. Both front and rear drive shafts will have to be replaced (may be able to just shorten one of them). The cross member will most likely have to be moved into the other set of holes. You will have to vacuum for the vacuum modulator on the TH400.
If you do go forward with this, there may be somebody wanting all the manual parts, so don't toss them. The 4sp manuals are more desirable in many cases.
Out of curiosity, why are you wanting to switch it?
Oh yes, you need a flex plate for your engine (AMC's are externally balanced, and each displacement has its own balance). So if you have a 360, you need a flex plate for a 360. And as I recall, the automatics don't use a pilot bushing at all, the manual will. So it needs to be removed.SRT6 wrote: ↑Thu Mar 11, 2021 1:42 pmThanks! My wife found the truck and she can't drive stick and mainly want's it for easy, chill rides down to old town, etc. So you basically need everything between the front and rear axles, and everything up to the engine block, plus a new pilot bearing. OK. Why the new pilot bearing? Flywheel too? Sorry. I have done these swaps in both directions on many mustangs, miata's, etc with no drama.Stuka wrote: ↑Thu Mar 11, 2021 1:34 pm You can also use a floor shifter with the auto.
As tgreese mentions, you have to pull the transmission (TH400) apart in order to change out the output shaft to work with a D20, as well as buying the adapter. OEM adapters were very brittle and often cracked, and were only available for a few years. 74-79 was Quadra-Trac only behind automatics.
Also you have to change the pilot bushing out on the back of the crank. Both front and rear drive shafts will have to be replaced (may be able to just shorten one of them). The cross member will most likely have to be moved into the other set of holes. You will have to vacuum for the vacuum modulator on the TH400.
If you do go forward with this, there may be somebody wanting all the manual parts, so don't toss them. The 4sp manuals are more desirable in many cases.
Out of curiosity, why are you wanting to switch it?
Another path...