Flywheel issues

[Srubydo1986]

OK my truck is a 1986 when i look for a flywhell it trys to give me one for a 700r4. I went to gm to buy one when i built the truck funny thing is looks just like the one autozone has but it for a 700r4. So that leads me to think gm sold me a flywheel for a 700r4 tranny not a th350.


Reason im having this problem the trucks motor is an 1989 so the circle on the back of the crank is smaller then that of a 85 down. I need a flywheel for that engine and tranny combo but i cant seem to find it. Any one know where i can get a flywheel for this problem.


(when i installed the one from gm the flywheel lasted o 3 months the teeth started to break and the truck would shack when in gear and at a stop light. Id say because of the wieght on the flywheel, and the wieght on the coverter are fin each other up causin shackin.


some one help me out i need it to work. And gm going to hear a bit to

[boatpuller]

Originally Posted by Srubydo1986

OK my truck is a 1986 when i look for a flywhell it trys to give me one for a 700r4. I went to gm to buy one when i built the truck funny thing is looks just like the one autozone has but it for a 700r4. So that leads me to think gm sold me a flywheel for a 700r4 tranny not a th350.


Reason im having this problem the trucks motor is an 1989 so the circle on the back of the crank is smaller then that of a 85 down. I need a flywheel for that engine and tranny combo but i cant seem to find it. Any one know where i can get a flywheel for this problem.


(when i installed the one from gm the flywheel lasted o 3 months the teeth started to break and the truck would shack when in gear and at a stop light. Id say because of the wieght on the flywheel, and the wieght on the coverter are fin each other up causin shackin.


some one help me out i need it to work. And gm going to hear a bit to

i'd call a transmission shop in your area.they'll give you the numbers for the right one.

[Smurfer643]

Make sure your asking for a flexplate and not a flywheel too, thats gonna cause some parts people some problems when your trying to order it. I know it sounds silly, but its true.

[trkklr77]

why are you telling them its for a th350 or 700r4 or anything at all? it has nothing to do with what tranny [other than auto or manual], it has everything to do with your motor. tell them you need a dual pattern[ large and small circle for tourque converter] for your specific motor, a 305 is not the same as the 350.

[dwaite72lnghrn]

Is your flex plate 14" or 12 3/4"?
14" 1 piece rear seal flex plate can come in dual pattern 10 3/4" and 11 1/2" pattern. SBC internal balanced any size except 400(external balanced). I think GM part#14088761
12 3/4" 1 piece rear seal flex plate have a 10 3/4" pattern.
Check your torque converter size will determine the flex plate compatibility.
Note: if you have a high stall TC you might have to go aftermarket flex plate, As it could be flexing the stock flex plate to much.

[Srubydo1986]

well iv had many people tell me the 700r4s flexplate is the same as the th350 so im going to the zone to get the flywheel. It worked last time so ill just do it again.