Lowering block size.....

[BobT-47P15]

Would a 5 x 2 x 2 lowering block fit the rear spring on the P15?

I know this has been discussed before but can not find the dimension

needed.

Thanks.

[1940Mopar]

should work as long as the 5" dimension is overall length and not height. The biggest issue is to have them seat properly on the leaf spring so that U bolts line up in a parallel fashion. You want your U bolts to look like this ||

and not \ /

[BobT-47P15]

Im thinking the width of the block is an issue. The P5 springs are not as

wide as some others. This block should be 2" wide by 2" tall by 5" long.

[Don Coatney]

should work as long as the 5" dimension is overall length and not height. The biggest issue is to

have them seat properly on the leaf spring so that U bolts line up in a parallel fashion. You want

your U bolts to look like this ||

and not \ /

Because the spring perch on my replacement differential is wider than my P-15 springs I had to heat

and bend my U-bolts. Close to

15,000 miles and no problems to date.

[1940Mopar]

Don,

Your's looks great because the bottom of the bolts ended up parallel even if the tops are not. The heating and bending should do the trick. However, I've seen some that installations where the owner did not take your approach and the results were not good.

[Normspeed]

Im thinking the width of the block is an issue. The P5 springs are not as

wide as some others. This block should be 2" wide by 2" tall by 5" long.

You're right Bob, the Plymouth springs are narrower than the usual Ford and Chevy stuff. You either need narrower blocks if you can find them, or make some up out of steel tube with a rectangular cross section.

I believe the P15 springs are 1 3/4" wide.

I found my narrow blocks in a box of assorted lowering stuff at a swap meet, $10 for the whole box. They had the name "Lewis" cast into them. They were a little too tall for my application and a forum member cut them down for me on a CNC machine.

[BobT-47P15]

There was just a set of 2" blocks on ebay, but I let them slide by.

Not sure if I need them really. Might if I ever get new rear springs.

For the last several years have kept some weight just behind the rear

seat in front of the differential hump in the trunk. Used to have a couple

old 6 cyl engine heads there...now have a couple of 60 pound sand bags.

Give the car a little heavier feel plus lowers the rear just a smidge.

[bob westphal]

I bought my lowering blocks from Hot Rod & Custom Supply. The below site will take you there.

http://www.parts123.com/parts123/yb.dll?parta~partsort

[1940Mopar]

am I correct that the leaf springs are 2" wide. If so, that is a great link although not the correct address.

Here it is.

http://www.parts123.com/parts123/yb.dll?userwatch~dynamicSearchPage~cadefeex

[martybose]

The rear springs on my P15 are 1-3/4" wide; a 2 inch block wouldn't work. My lowering blocks are 1-3/4" wide, and work fine.

Marty

[1940Mopar]

thanks.....the link above has both. I wanted to make sure before I ordered.