So as I mentioned in my other thread. I've the TH350 I'm trying to put in the Bravada has both the Chevy and BOP bell housing patterns on it. It also has a torque arm mount. I can't think of anything that would have needed the BOP bellhousing, AND a torque arm mount. So does anyone have a gas as to what this transmission was in originally? I pulled it out of an '84 Trans Am where it was bolted to a Chevy 350. I don't think that was it's original home though.
Its a 200r4. Only factory trans available with a bop bellhousing AND torque arm mount to my knowledge.
Pics would help
And that was only in mid 80s f body
They went to the dual pattern so that they didn't need to make both a BOP and Chevy pattern. You can find them in cars and trucks with both Chevy, Buick and Olds engines. I don't recall ever seeing them in anything with a Pontiac. It certainly could have come in the '84 TA you pulled it from.
Dusterbd13 wrote: Its a 200r4. Only factory trans available with a bop bellhousing AND torque arm mount to my knowledge. Pics would help
You know, I think you're correct. I don't think the 3rd gen F bodies ever had a 3 speed auto in them. Did they?
Google seems to indicate that there were dual pattern TH350s built in the 70s, if the torque arm tail housing is original to the trans that would point to the Chevy Monza and BOP derivatives, likely 1975 since the crappy TH200 three speed was introduced in 76.
I never knew that the monza had a torque arm.
Im pretty sure that is a 200r4. What shape is the pan?
looks like the TH350 pan. Whatever it is, it's under the truck now.
MV4 is a TH350C with locking torque converter, that's what that wire does.
Ok so how big of a problem is it that I have a non lockup converter on it now?
Chadeux wrote:
I vote Monza as well. I had a weird Saginaw 4-speed that had pretty much the exact same set of holes on the tail housing behind where the shifter mounted. Best I could tell the codes on the transmission indicated it was from an H-body type car. Or maybe the guy who bought it from me told me that. Either way it sounded plausible.
That wasn't original to the Firebird. The trans is a random 350 out of whatever, and the tailhousing is from a Monza. I did the very same thing when the TH200 got shredded in my 82 Camaro. Bought the tailhousing new from GM.
I want to apologize for the red herring I put forth as good information. Should have kept my mouth shut.
Chadeux wrote: Ok so how big of a problem is it that I have a non lockup converter on it now?
According to this random guy, big.
STOP!!!!! The converters are NOT-repeat NOT interchangable between TH350 and TH 350C. The TH350C has a 3/4" pilot on the end of the input shaft where the converter slides on and requires a lock up converter design ONLY. The option is to have the 350C converted to non lock up by changing the input shaft,which requires substantial trans disassembly. There are hi stall lock up converters for the 350C available as stated in the previous posts.The non lock up converter will not fully engage the splines of a 350C shaft.All you will do si burn the trans up if the car will even move. About 15 yrs ago my buddy Tim had that problem with a Grand Prix and a 355/350 combo.It drove for about 12 miles and then let go.Metal in the fluid,a loud BANG and the car stopped.Found that problem and the splines all stripped out.OUCH!!!
Well here's how I'm processing this information. It's already together, It felt like the converter seated when I put it on. This transmission was pretty much free. I'm going to try it and see what happens. If it does fail as described, I had a deal lined to trade the old 4wd 700R4 to a friend for a TH400 anyway.
EDIT: I told one of my friends about this find, he calls me immediately saying how confused he is that I ended up with this for my V8 S10 project and he also confirmed random corvette forum guy's thoughts. So I might end up either buying a converter or switching to a different trans.
Yup... TH350C.
Also agree.... converters are not interchangeable. The "C" is a lockup unit; different valve bodies, circuits, etc. Putting a non lockup converter in a lockup trans sends fluid to places it shouldn't go and things go south fast. You'll likely end up freewheeling in third very soon and/or shredding the pump.
BTW... the TH350 with the dual pattern is a super rarity. In all my years running transmission repair shops and working in hot rod shops I have seen exactly two units prior to yours. It might actually be worth something to someone who wants to build something stouter than a 2004r behind a BOP and doesn't want to squeeze in a TH400.
Dusterbd13 wrote: Im pretty sure that is a 200r4. What shape is the pan?
200-4r's didn't have a removable tailhousing or vacuum reference.
One issue I see with selling it is that there's a corner missing off of the bell housing around where the starter goes. I ended up with this transmission as a I said because it was in a rust bucket '84 Trans Am parts car I bought. This one is getting used because I'm more confident in this one working than my other TH350, which came out of my '86 Firebird. (Yes, I had 2 rusty 350/th350 swapped 3rd gen Pontiacs, I drove neither of them)
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