flywheel q's

[Cecil14]

Is the flywheel from a '79 J-10 with a 258 and a T-15A 3 speed the same as one from an '83 J-10 with a 258 and a T-176 4 speed? Are they interchangable?

Thanks,
Anthony

[joe]

The p/n's for the 258 flywheels changed in 80 again in 81 and once again in 82. Why the different numbers I have no idea but I don't see why they wouldn't swap?

[Cecil14]

Well, my problem is that the ring gear on my current flywheel is getting chewed up pretty good and I don't think it's helping my starter any. I've got a new ring gear, but I would like to take a different flywheel and get it done. Then I can get just swap them out while I've got everything apart instead of waiting to have it done and not having anything to drive.

Thanks,
Anthony

[joe]

Anthony so long as you get the flywheel resurfaced at the same time since the two different trannies prolly used different size clutches with different wear grooves, I don't see why it wouldn't work. Only possible reason for the part number changes I can think of is that maybe they lightened the flywheel in 80 a little bit to squeeze some better mpg's out of the motor. That's just a W.A.Guess though????

[Cecil14]

I know they took like 11 lbs. off the crank in '80 or '81... only think I can think of is that maybe it has to do with the balancing of the motor. Less crank weight= less flywheel weight? Either that or it was something they tried to do for mpg. They were famous for that in the '80s...

Thanks,
Anthony