what size clutch do i need?

[67cst]

well the 71 left me stranded lastnight, the clutch went so i got it towed home today and next weekend she is getting a new clutch, and bearings. anyways i think the book shows 2 different sizes...11 and 12 inch i believe..what should i go with? its a 350/4spd set up

[69 longhorn]

If you are going with a stock replacement, i would go 12" on the clutch....Centerforce, Hays, ect, go 11" . the same flywheel bolts either setup, but most of the high performance clutches will be 11".....69L

[67cst]

what would last longer? this truck is my daily driver so i dont need perfomance or anything just reliability and for it to last long as possible

[passthebuck]

I changed my clutch myself last summer & I got a 12" (i know I dont need a 12" but an 11" clutch was 160 so for 15 more bucks I got a killer clutch) OEM clutch (throwoutbearing, friction disc, pressureplate & alignment tool) for diesel GMC's for 175CDN from a local clutch shop & they ground my flywheel for that too, but it took 2 days & while I was there, I changed the rear main seal as well. I have a L-6 & a three-on-the-tree. Mione's a dailydriver too & my reasoning sez that a 12" would last longer. MANY high perf clutches are 11" - this is for less rotating weight & not necessarily durability.

[69 longhorn]

I agree, for a daily driver, the 12" stock replacement is a good deal. If you like to run hard off road, or race a little.....Centerforce dual friction is the way to go. it just depends on intended useage L

[Brainchild]

I'm running an 11" with the same combo,have no problems with slippage and ect.

I'm going to a twelve when I have to change it prolly.If you're not doing much tugging and towing an 11" will be fine.If it's just a few bucks more go for the 12.

[67cst]

thanks guys