th700r4 from v6 to v8

whitewheels · May 16, 2021

Something tells me that this have been asked manny times [emoji89] Trying to search but got like 300+ hits
So I'm taking my th700 from my v6 and puting it behind my rebuild 305. I recal reading about some recalibration kit when you fit a v6 tranny behind a v8....or can I run it as is?

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PlayingWithTBI · May 16, 2021

whitewheels said:
I recal reading about some recalibration kit

This recal kit is used to change weights and springs in your governor to adjust shift points in the 700R4. FWIU the 6 cyl torque converter has a higher stall than the V8, YMMV

https://www.amazon.com/TCI-326500-R...d=1&keywords=TCI-326500&qid=1621191277&sr=8-1

Schurkey · May 18, 2021

The V-6 trans probably has fewer clutch plates in the drums.

I'd expect valve body and governor differences.

It'll "work", but it won't have the torque capacity like a trans made for a V-8.

All it takes to fix that is a rebuild to V-8 specs.

I put a V-6 Astro trans into a '76 Nova. Worked fine except for the crappy aftermarket torque converter clutch switch system.

DamHoodlum · Nov 19, 2022

I believe there is a difference internally between the 700R4 V/6 & V/8

I used the V/6 converter & 700R4 transmission when I switched to V/8

Mine worked as expected before I switched to a TH350

Nad_Yvalhosert · Nov 19, 2022

Seeing as this thread is a year & a half old, I'd like to know how or if the v6 tranny held up to the v8...

Schurkey · Nov 20, 2022

Worked great in my Nova for over a year, driving 60+ miles to work round-trip, mostly at plaid speed...until I parked it on the street, and a pizza-delivery guy ran into it.

Sold the car to a fellow a couple towns over; his plan was to take the engine, trans and subframe for some hot-rod he was building.

But the Nova is a light car, not a full-size truck; and I never towed anything or loaded the trunk with heaps of dead weight.

DamHoodlum · Nov 20, 2022

Mine held up fine, actually towed my racecar with it one season.

The V6 converter helped with a little bit of stall.

TH350 worked better for my application since I'm not worried about OD or gas mileage

th700r4 from v6 to v8

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