Bell Houseing Bolt Pattern
Posted: Mon Jan 11, 2010 4:14 pm
Got the bolt pattern/tranny issues under control. There are three relevant bolt patterns for our tranny search.
1. Known by four names: Metric, S10, 60 Degree V6, and Small Corporate. Used in the Camaro, FireBird, and S10 60 degree V6s.
2. Chevy. Used in the 90 degree V6s (except our 3800 FWDs) and Chev V8s.
3. BOP (Buick/Olds/Pontiac)
All of Willdy's 3800s have the 60 degree/Metric pattern.
The only 4-speed, RWD,OD, lockup TQ transmission with the metric pattern is the TH700r4s that came in the V6 Camaros, Firebirds, and S10 v6s (not 4.3L) It also comes with a different case to fit the Chevy V8 pattern.
The TH200r4 is another 4-speed, RWD, OD, lockup TQ AT. It comes in only one case but has a dual (Chevy and BOP) bolt pattern.
On the Raleigh Craigslist there was a 60 degree TH700r4 with 22K miles on a rebuild out of a 2.8 Firebird for $100. Unfortuniately, the shipping to Tucson was about $175. Still a good deal but Willy has cheaper options.
He has a TH200r4 (also a RWD, 4-speed, OD, lockup TQ) and picked up a TH700r4 with the V8 pattern for $50.
So, now he has two transmissions that he can use if he builds an adapter and a friend that's eager to machine one for him. If they build the adapter to the V8 pattern, they will be able to bolt up either the TH200r4 or the TH700r4.
We have blueprints that show the dimensions for the BOP and Chevy V8 bolt patterns but CANNOT find the dimensions for the 60 degree pattern. I've searched the internet and a few forums but am coming up empty. Willy's friend really wants the factory specs - he'll locate those holes dead on and doesn't want to deal with measuring worn dowl and bolt holes.
The other thing I'd really like to find is a description of 3800 factory balancing. I can't find anything that says if the 3800s are balanced externally (think they are) or internally. Or if all 3800s have the same internal imbalance. Don't know if we have to worry about mismatched flexplates or harmonic balancers.
If anyone has any ideas on where to find info on the metric pattern dimensions or 3800 balance I'd appreciate it.
1. Known by four names: Metric, S10, 60 Degree V6, and Small Corporate. Used in the Camaro, FireBird, and S10 60 degree V6s.
2. Chevy. Used in the 90 degree V6s (except our 3800 FWDs) and Chev V8s.
3. BOP (Buick/Olds/Pontiac)
All of Willdy's 3800s have the 60 degree/Metric pattern.
The only 4-speed, RWD,OD, lockup TQ transmission with the metric pattern is the TH700r4s that came in the V6 Camaros, Firebirds, and S10 v6s (not 4.3L) It also comes with a different case to fit the Chevy V8 pattern.
The TH200r4 is another 4-speed, RWD, OD, lockup TQ AT. It comes in only one case but has a dual (Chevy and BOP) bolt pattern.
On the Raleigh Craigslist there was a 60 degree TH700r4 with 22K miles on a rebuild out of a 2.8 Firebird for $100. Unfortuniately, the shipping to Tucson was about $175. Still a good deal but Willy has cheaper options.
He has a TH200r4 (also a RWD, 4-speed, OD, lockup TQ) and picked up a TH700r4 with the V8 pattern for $50.
So, now he has two transmissions that he can use if he builds an adapter and a friend that's eager to machine one for him. If they build the adapter to the V8 pattern, they will be able to bolt up either the TH200r4 or the TH700r4.
We have blueprints that show the dimensions for the BOP and Chevy V8 bolt patterns but CANNOT find the dimensions for the 60 degree pattern. I've searched the internet and a few forums but am coming up empty. Willy's friend really wants the factory specs - he'll locate those holes dead on and doesn't want to deal with measuring worn dowl and bolt holes.
The other thing I'd really like to find is a description of 3800 factory balancing. I can't find anything that says if the 3800s are balanced externally (think they are) or internally. Or if all 3800s have the same internal imbalance. Don't know if we have to worry about mismatched flexplates or harmonic balancers.
If anyone has any ideas on where to find info on the metric pattern dimensions or 3800 balance I'd appreciate it.