Driveshaft & lowering question.

[Mayronus]

HI, All
Ive swaped 305 TPI with TH700 in my Cutlass 1984 3.8v6 TH200c.
I need to shorten driveshaft can someone please tell me how much exact ?
is it 3" ??

I would like to use this crossmember:
http://www.summitracing.com/parts/SUM-770301/?rtype=10

I have front and rear aluminium bumpers and im planing to use fiberglass hood and i have AC removed.

I would like to go with OPG 3" lowering springs all around.

Ive bought long time ago 2" crap lowering springs from Ebay when i jack up car rear spring is faling on the ground.

Is 3" OPG the same design i will need to use shorter shocks?

Also im wondering if i use 3" lowering springs on the back and front will front be on the same lavel or higher that rear with my setup?

Many Thanks

 

[565bbchevy]

Places that shorten driveshafts will want a specific measurement usually from the end of the trans tailshaft housing to the edge of the pinion yoke with the rear loaded.
With a lowered car it is easiest to put the car on 4 ramps to give you room to measure or a drive on hoist if you have access,
I use 4 ramps all the time to work on mine.
There are too many variables to have a set amount to cut off, what works for one car might not work for another
it's best to do it right the first time.
And make sure it is a reputable local shop that will cut and rebalance it properly or you could have a new better and stronger one made by a reputable company (Denny's Driveshaft, DTS, etc.)