AMC to AMC swap questions...

[Nikkormat]

If I were to take a motor out of a newer FSJ mated to a TF727 and put it in my Cherokee mated with a TH400 what problems would arrise? Would it be a simple bolt in swap or would the fly wheel and other parts related to transmission-engine connection need to be exchanged as well? Any other advice in going from old AMC V8 to new AMC V8?

[csuengr]

Need to swap over flex plates. Also, there is a spacer ring inside the crank on the TH400 one that needs to be swapped over also. It fits over the snout on the TH400 converter.

[Stuka]

Above post has you covered. You need a flex plate for a TH400 for the engine you are putting in. AMV V8's are externally balanced. So if the new engine is a 360, you need a flex plate for a 360.

And you will need the crank bushing for use with a TH400.

Neither part will cost you much and are readily available.

[carnuck]

Just beware of pre '72 motors! The crank pilot design changed from flat to ridged.

[carnuck]

[Nikkormat]

Ok so would need to swap Flex plates, move a bushing, and not use a pre 72. Got it. Thanks Guys!

[carnuck]

Remove the TH400 sleeve and toss. Not worth saving unless you plan a GM trans swap in the future.

[Nikkormat]

Actually I was asking in the event that I need to go from a motor set up for tf727 into my Cherokee that has the th400. And I do plan to do a 700r4 swap in the distant (very distant) future.

[carnuck]

The sleeve is available new from bulltear.com

[Nikkormat]

OK, I'll have to consider one. Thanks for the information.

[carnuck]

If you are careful with the install, many run a long time without the sleeve, but others crack their flexplate.

[Nikkormat]

I don't know if I'd be daring enough to push my luck on not cracking the flexplate. And if I do end up having to swap in a newer motor I'll still have the old sleeve from taking the original motor out.

[carnuck]

If you get it out in one piece. Ever see a speedi-sleeve? Pretty hard to pull without crushing it.

[Nikkormat]

No. No I haven't. I assumed it would be reusable. I will order a new one if I decide to go down that path with my swap.