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Th350 to 700r4 or 4l80e. #733686
March 03rd 2018 8:57 pm
March 03rd 2018 8:57 pm
Joined: Sep 2016
Posts: 38
Illinois
V
Vanereal_Disease Offline OP
newbie
Vanereal_Disease  Offline OP
newbie
V
Joined: Sep 2016
Posts: 38
Illinois
I currently have a th350 but would eventually like overdrive. I have a slightly built 350. Just a few edlebrock parts and headers in a 1976 G10. I want to road trip in it with very little to no towing.

Here are the options I’ve tossed around:

Keep the th350 and get higher gearing in the rear end.

Swap to 700r4. I’ve seen mentioned that they need a few upgrades to become reliable. How extensive? Am I right in thinking that this would be a drop in swap?

Swap to 4l80e. Probably the best option, but also the most expensive. I think the transmount needs to be relocated, driveshaft shortened, find a suitable wiring harness and computer... I have a line on a unit ($150) that doesn’t have reverse so a rebuild is in order.

I am capable handling installation and any fab work with the exception of a rebuild, but if it’s not necessary, I would rather spend the time and money else where on the van.

Thoughts?


Re: Th350 to 700r4 or 4l80e. [Re: Vanereal_Disease] #733688
March 03rd 2018 10:12 pm
March 03rd 2018 10:12 pm
Joined: Sep 2005
Posts: 8,517
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,517
Georgia, USA
The 700R4 is a quick, popular swap. A lot of transmission shops have done it and there is advice and how-to videos all over youtube. The lower first gear is nice too.
My2%.
Add a set of 31" tall tires in the rear and you be cruising......

Last edited by CatFish; March 03rd 2018 10:13 pm.

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There are only two real tragedies in life. One is not getting what you want and the other is getting it.
Re: Th350 to 700r4 or 4l80e. [Re: Vanereal_Disease] #733690
March 03rd 2018 11:37 pm
March 03rd 2018 11:37 pm
Joined: Sep 2016
Posts: 38
Illinois
V
Vanereal_Disease Offline OP
newbie
Vanereal_Disease  Offline OP
newbie
V
Joined: Sep 2016
Posts: 38
Illinois
Thanks catfish. I’m leaning towards the 700r4 but wanted to see if I could be convinced otherwise.


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