If it was me I would bolt up the transmission and make sure the mount is correct. Do you have a known good crossmember for the transmission mount, or just the one that came with it?
350/700R4 85 El Camino
- Thread starter K-Toe
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The transmission is mounted to the original crossmember. However, with my current clearance problem, I will have to ditch the old one for a new one (a GFORCE for example) in order to route the muffler system.
I don't think the original crossmember is correct for the 700R4, when you get the correct one it may pull the motor back to the correct position. Maybe call GForce and see what they say, I got my crossmember from Lemon's headers and its a much nicer piece then the others out there, Dan is a great guy you could give him a call.
I was just looking back at my pics of swap. mounts look like they are in the same place as yours are. I did have to buy a g-force crossmember for 700r4, from orginal setup I had to shorten driveshaft since 700 is longer than 200c setup. I used flowtech longtube headers on mine with no clearance issues
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Thanks! I will check out Lemon's! BTW, I offset the original crossmember to compensate for the length of the 700R4, using only one of the bolt holes on the passenger side. Not ideal...but it worked.
I've had header issues with headers when I first installed a Chevy ZZ350 in my 1981 Oldsmobile Cutlass Diesel (what a dog). My first set of headers were Hookers, and sure enough, true to it's name one of the pipes hooked over and passed through the fender-well, hideous. My turning circle became like a truck's, and my tires rubbed on the offending pipes. The Hedman Hedders (I guess their shorties?) solved the problem. I swapped the ZZ350 to a ZZ383, but kept the Hedders with no issues, except in the back of my mind, the Hedman's are 1 5/8"s primary tubes whereas the Hooker's were 1 3/4". If anyone out their can advise me who makes headers for a small block Chevy in a G-Body, that is 1 3/4" and runs under the car, NOT through the fender-well, I would really appreciate.
You said the 700r4 transmission was mounted to the original crossmember. Unless the original V6 came with a 700R4, then the frame mounts are definitely in the wrong place on the front frame. If that is the case, then I'd recommend that you do it right and pull and reinstall the engine after moving the motor mounts back by an inch and a half or so. Also, make sure you have the correct Chevy mounts for your year car with the V8.
William: According to the VIN, she was originally a V6. As far as I know, my 700R4 is a swap and not original to my 85. That said, the 700R4 is mounted to the original crossmember, but it is offset (moved further back) using only one of the bolt holes. I did that in compensation for the increased length of the 700R4.
As far as the motor mounts go, the are for a V8. I have gotten a number of conflicting recommendations on where they should be placed. Currently, the are positioned as per the attached photo.
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GM never offered the TH700R4 in any '78-'88 A/G, only the TH200 4R in later models. As for you mounts, there is only one spot for SBC mounts & yours are in the right place. Cant figure out why someone would reuse V6 frame side mounts in a SBC swap.
pagrunt: Saaaaweet! Thanks for your feedback on my motor mounts!
Regarding my clearance issue: I removed my headers today, and I heated them to massage the metal to gain 1/4 of an inch of clearance between the frame and them. I have no idea what brand they might be, but I will massage them to a reasonable point before I toss them in the "ain't worth my time" pile!
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