13b To Gm Auto Trans Adapter ?
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Joined: Feb 2002
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From: Amityville, New York
Originally Posted by bill shurvinton' date='Jan 2 2005, 07:25 PM
Prolly a TH350, unless I can find a 200R4. The guy ships in 350s and similar for cobra replicas and so for each engine that comes in he ends up with a free tranny. Early days yet as I'm still scheming waht to put it in.
I only know about manual boxes, where you really need roller bearings to do big RPM.
I only know about manual boxes, where you really need roller bearings to do big RPM.
a 700R4 would be a much better choice if your going automatic overdrive
I think the GM swap is mainly a drag race thing only
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I'd forgotten the thread subject. Automatics!
The TH700-R4 is not that good a performance transmission compared to the 3-speeds because its gears are spread so much further apart.
Automatics can be made to live behind high RPM but you end up spending a lot of money.
The TH700-R4 is not that good a performance transmission compared to the 3-speeds because its gears are spread so much further apart.
Automatics can be made to live behind high RPM but you end up spending a lot of money.
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Joined: Dec 2003
Posts: 162
Originally Posted by heretic' date='Jan 2 2005, 05:29 PM
I'd forgotten the thread subject. Automatics!
The TH700-R4 is not that good a performance transmission compared to the 3-speeds because its gears are spread so much further apart.
Automatics can be made to live behind high RPM but you end up spending a lot of money.
The TH700-R4 is not that good a performance transmission compared to the 3-speeds because its gears are spread so much further apart.
Automatics can be made to live behind high RPM but you end up spending a lot of money.
Depends what you mean by a 'lot'. This would be for a street/drag combo. It's just that here in the UK auto knowledge is hard to come by except for the very top end of the drag market.
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The TH700-R4's First gear is around 3:1. Second is around 1.7:1, Third is 1:1, Fourth is about .7:1.
That's awfully wide. It's a lot wider than the transmissions Mazda used on rotaries, which incidentally are almost exactly the same ratios as the TH350/400.
I placed a rear side housing up to a Chevy V8 pattern transmission, and I didn't see where even one bolt was anywhere near close, no matter how far I rotated it back and forth.
When you say you used a Chevy S-10 bellhousing, I wonder if you got a transmission from a 2.8 liter V6, which has a different (smaller) bolt pattern. I'll dig up a trans with that bolt pattern and see if that does the trick.
That's awfully wide. It's a lot wider than the transmissions Mazda used on rotaries, which incidentally are almost exactly the same ratios as the TH350/400.
I placed a rear side housing up to a Chevy V8 pattern transmission, and I didn't see where even one bolt was anywhere near close, no matter how far I rotated it back and forth.
When you say you used a Chevy S-10 bellhousing, I wonder if you got a transmission from a 2.8 liter V6, which has a different (smaller) bolt pattern. I'll dig up a trans with that bolt pattern and see if that does the trick.
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Posts: 12,288
From: Amityville, New York
I wasnt talking about gear ratios, I was talking about building them to take on more power. The 700R4 was used in place of the 200R4 starting in the late 80s I believe and could take more abuse then the 200r4, plus I believe there are alot more parts availiable for the 700r4.
for drag racing I wouldnt bother with a 200r4, I would go powerglide or even turbo350
if its a street car and overdrive is important then I would go with the better of the autos and go with the 700R4
for drag racing I wouldnt bother with a 200r4, I would go powerglide or even turbo350
if its a street car and overdrive is important then I would go with the better of the autos and go with the 700R4
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Joined: Dec 2003
Posts: 162
Originally Posted by Rob x-7' date='Jan 3 2005, 06:02 PM
I wasnt talking about gear ratios, I was talking about building them to take on more power. The 700R4 was used in place of the 200R4 starting in the late 80s I believe and could take more abuse then the 200r4, plus I believe there are alot more parts availiable for the 700r4.
for drag racing I wouldnt bother with a 200r4, I would go powerglide or even turbo350
if its a street car and overdrive is important then I would go with the better of the autos and go with the 700R4
for drag racing I wouldnt bother with a 200r4, I would go powerglide or even turbo350
if its a street car and overdrive is important then I would go with the better of the autos and go with the 700R4
Reason for the 200R4 as an option is the number of buick GNs putting big HP through them, so it is proven (at a cost). I suspect I'll end up being a cheapskate and using what I can readily get and then go from there.
