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Tranny Upgrade~ 350TH to 700r4

vwnate1

vwnate1

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Anyone here done this ? .

Pitfalls ? .

Will I need a different crossmember ? .

How to recognize the 700r4 tranny when I'm in the junkyard ? .

TIA ,
 
I just put one in mine less than a year ago. I got lucky and had the long tailshaft 350 already in my truck....the 700 is identical! For the short shaft 350, the 700 is 2-3" longer and the crossmember moves back about the same. I would think you could just redrill the holes for the crossmember in the frame rails and slide it back. You will also have to shorten the driveshaft. The 700 is well worth the swap.
 
1St. Reply

THANK YOU ! .

I have no idea what TH350 I have now , I'd also like to hear what vehicles to look for with this tranny when I'm junkyard shopping .

Pix would be good .

Can I re use the same crossmember ? .

No worries on the driveshaft as it has the original U-Joints (no Zerks) so I needed to yank it for rebuilding anyways .

Keep the tips , hints and conversion stories and warnings coming please ! .

.
 
Most gm cars and trucks from the mid 80s with OD are 700r or 200r. Do a search as there are more desireable years. I may have one coming available soon from the 60 Dodge project truck, it has a 350/700R combo coming out. I also have a local builder who can build it up for $400......CHEAP and RIGHT, He does all of our trans. work.
 
Trannies

THANX ! .

I have heard the 200r is O.K. too , as this will be a light duty if high mileage truck , maybe that'd be O.K. .

Too bad you're so far away :( prolly cost too much to ship to me here , even By Greyhound .
 
TH350 Lock Up

Thanx ! .

I see they offer a lock up torque converter option on their rebuilt TH350 , including the torque converter it's $1,500 , sounds maybe this is the way to go as it'd bolt in to my current cross member .

Do you know , off hand , what the stock TC stall speed is ? I'm very happy with whatever it is now , stall speed wise .
 
I too was thinkin of swapping in a 700r4 I have in the garage into my 72. the tranny is out of an 87 monte carlo, so my concerns is if it will work, and if it will withstand the horsepower I have in the engine.
 
Tranny Upgrade

Yes , it's do - able , just be aware you'll have to move the cross member back a bit and shorten the driveshaft , run some new wires etc.

This is why in the end I decided to go with a TH350-C , it's only a lockup torque converter on a TH350 but they build up the TH350 so it'll handle mucho horsepower .
 
Too Late !

As my rebuilt TH350-C came , we picked it up Wednesday after work .

I'm averaging 16 MPG's now @ 65 MPH & 28" tires....

I sure do use a lot of oil though ~ I'll send the cylinder head out soon , I heard about some old Guy in a Machine Shop who actually knows how to properlydo L6 heads and isn't above working on lowly 6 - Bangers .

Trick is , I managed to lose his 'phone # :( .
 
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