Re: Making the switch to a 9", new driveshaft or can it be c
I've done research on driveshaft critical speed vs rpm and length. but what im asking is, do i need to cut my driveshaft and have it rebalanced or or do i need a longer driveshaft when switching rear ends? i think the pinion sits closer to the front of car on a 9" then a 8.5 does.
what the difference in length for driveshafts when comparing 9" to 8.5"?
BTW i already have a 3.5" mark williams bonded mmc driveshaft. as mark williams suggested it beings my shaft needed to be 62-3/8" long.
Re: Making the switch to a 9", new driveshaft or can it be c
im not sure your understanding my question correctly. i originally had the mark williams driveshaft cut for an 8.5 grand national rearend but now im going to swap the 8.5 for a ford 9". will the driveshaft for the 8.5 be too long or short or will it bolt in.
i havnt been able to put the 9" in the car yet otherwise i would just measure. im sure somebody has swapped from a 7.5 or 8.5 to a 9" right?
Re: Making the switch to a 9", new driveshaft or can it be c
I did the 9" swap from a 7.5 with a muncie. Used the same drive shaft but just changed the u-joint. Don't go by what everyone says.... measure yours to make sure its right.
Re: Making the switch to a 9", new driveshaft or can it be c
I agree^^, you will need to measure to be sure.
Engine/Trans/Rear mounting tolerance stack from car to car can be different, Aftermarket Control Arms are different lengths etc.. etc..
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