redwhitekat

Ok on my 74 I have a trw leaf spring but the back end still sits a bit high. Anyone can give me tips on how to lower it about 1 inch ?? Never done this how hard is it and what would be involved

MelWff

Are you using the 8" spring bolts? If you are you can lower the height by bringing the nuts lower down on the bolts. You then will have to realign the rear.

redwhitekat

Thanks I will look into what type of bolt I have and see if I can lower the nut if not I guess ill need longer bolts

v2racing

Just a note here. When you lower the back, you will need to have an alignment done. Lowering affects the camber and the toe on the rear.

redwhitekat

Thanks if I can lower it I will do that

MikeKey

I used VBandP's C4 10 inch rear spring bolts, you can go lower than you can with the 8 inch ones.

redwhitekat

That's a clean *** car

redvetracr

yea but why is it so high up in the air?

qwank

looks like he has a lot more adjustment in the spring bolts.

slam that thing down!!

MikeKey

I took that after I got everything put on and before I made all the final adjustments.

redwhitekat

Ok so got home today looked at your suggestions measured the bolts I already have 8 " bolts can I go longer bolts ? I would like it to drop about 3 " but hope my exhaust won't be too low

7t9l82

10 inch bolts

TROPIC_THUNDER

WHAT HE SAID

gcusmano74

Make sure to carefully check the clearance between the tire and the end of the spring if you lower it a bunch. Dick Guldstrand makes a short steel spring to deal with that very problem. Dunno about composite.

redwhitekat

Ya I've been looking at it if I get a 10 " bolt it will almost hot the ground I guess that's just the way these springs are oh well ill have to live with it for now

Kid Vette

10" bolts will only lower it 2" and your spring end will be gouging your tire side wall. I would return the spring (looks new?) and get a VBP spring. You will get the proper height with 8" bolts.

redwhitekat

Spring I got last year so prob can't return it when I put the 60 wall tires on its more noticeable my mechanic put the spring on and I didn't think it was gonna be so high Like I said ill have to live with it

Kid Vette

Muskegon Brake is the manufacturer of the TRW springs and a supporting vendor here. They are already aware of the problems with their springs being over arched. I'm sure if you contact them they will do the right thing and refund your money. Here's their quote from one of the threads below, "I would rather take back the spring than have an in-correctable ride height issue and a dissatisfied customer."

The following threads illustrate what a common problem this is:

trw mono spring

Rear sits to high with new spring

Just got the TRW Mono Spring did I make a mistake?

Identify Monospring

New rear spring ride height too high

rear composite spring

Composite Spring Vendors: RE: height issues

And I'm sure if you do a search you will find more.

redwhitekat

That would be nice of them

SLVRSHRK

Be careful to not lower too much using bolts and springs. The lower you go, the closer to horizontal your rear half shafts will be. You need to make sure they have a 1/2" drop from the diff to the trailing arms.

When you accelerate the suspension will compress and change the angle of the shafts. That 1/2" is there to make sure they do not get inverted and bind.

Keep that in mind whatever spring/bolt combination you end up using.

There are many folks on this forum much wiser than I regarding suspension geometry so I won't even attempt to try to fully explain it.

A solution I have seen is to raise the differential itself by notching the cross member. That will pull the entire suspension up into the car and still keep the geometry correct. It will mean less travel until you hit the bump stops, so they will need to be shaved down accordingly.

Good Luck