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-   -   gm350/700r4/np208 in CJ8 got questions (https://forums.off-road.com/jeep-short-wheelbase/188176-gm350-700r4-np208-cj8-got-questions.html)

bigbad8 03-03-2004 08:41 AM

gm350/700r4/np208 in CJ8 got questions
 
hi. i just got my hands on a 350/700r4/np208. its about 16 inches longer than the 304/th400/d20 that was in my jeep.
other than shortening the driveshaft in the rear and elongating the front driveshaft, are there other issues i need to be aware of? ALSO
to shorten things up, can i use the D20 behind the 700R4? that would save me like 9 inches or more.
this drivetrain came out of a suburban.
thanks for your input.

Olin18 03-03-2004 11:31 AM

Re: gm350/700r4/np208 in CJ8 got questions
 
Your question is a little vauge? What kind of isues are you wondering about, there are a lot. Be a little more specific.

A couple issues that jump out at me are cooling.. Is the factory rad from the 304 going to cool a 350... Probably not.

How about new motor mounts, your going to need a set.

Exhaust.... YOu are probably going to need to run a new system.

How about the shifter, how you going to shif the transmission....

And on and on.

Any time you put a motor from one truck into another, there are lots of issues.

general420 03-03-2004 11:53 AM

Re: gm350/700r4/np208 in CJ8 got questions
 
My first question is why? That 304 / TH400 / D20 sounds like a great combo. If you really need more power, find a 360 and call it a day. If it's for the overdrive....well that understandable. Don't get me wrong, it's your jeep, and should be however you want it.

The 208 will have a slip yoke to contend with, and not only is the eliminator kit expensive, it doesn't shorten the combo up. You can adapt it to the D20....but that's big $$$.

The radiator's bottom end will have to be switched (Chevy is backward from AMC) and that's only IF your factory radiator can keep up with a 350, and then all of the stuff Olin mentioned.

WILL 03-03-2004 12:32 PM

Re: gm350/700r4/np208 in CJ8 got questions
 
</font><blockquote><font class="small">In reply to:</font><hr />
that's only IF your factory radiator can keep up with a 350

[/ QUOTE ]

I swapped out a 304 for a 360 and don't have problems.

bigbad8 03-03-2004 12:44 PM

Re: gm350/700r4/np208 in CJ8 got questions
 
makes sense to add more detail. the drivtrain was swapped out of a 79 J p/u. the 304 had a blown #1 cyl. and cracked wall. the #6 and #8 cylinder walls were warping. the motor was ditched.
i'm not sure what radiator is in there. top hose is on the pass. side. return is on the drivers side.
i am thinking of keeping the th400. advance makes an adapter for the jeep tranny to the gm block.
does anyone make a twin stick for the dana20?
im using a lokar shifter for the tranny.

i wasn't sure if it was worth swapping the whole drivtrain or not.

bigbad8 03-03-2004 12:48 PM

Re: gm350/700r4/np208 in CJ8 got questions
 
i picked up a set of motor mounts conversion kit for the cj. bolts to the original holes.
i already had a cuustom exhaust for the 304, so i only need the shop to cut and extend the pipes to the new location. no big deal.
thanks. i didn't realize the np208 was a pain in the arse.
i knew that the slip yoke eliminator is $$ and i figured a d20 to 700r4 kit would be too. im trying to keep this cheap..sort of.:-)

WILL 03-03-2004 01:13 PM

Re: gm350/700r4/np208 in CJ8 got questions
 
</font><blockquote><font class="small">In reply to:</font><hr />
i am thinking of keeping the th400. advance makes an adapter for the jeep tranny to the gm block.

[/ QUOTE ]

If your TH400 needs to be rebuilt, the cheapest option would be to pull the output shaft from it and buy a GM bolt pattern TH400 for $50 or so and rebuild that with the jeep's TH400 output shaft.


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