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#2411590 - 11/30/17 09:35 PM 1990 ram bolt pattern swap
NTOLERANCE Offline
master

Registered: 08/17/03
Posts: 4315
Loc: Madison Wi
I have a 1990 ram 150 two wheel drive with the 5.5" bolt pattern

I want to swap the rear end to an earlier 8 3/4 d100 axle with the 4.5" bolt circle

Is there a front rotor I can use to change the front bolt pattern to match

I already have the truck 8 3/4


Edited by NTOLERANCE (11/30/17 10:26 PM)
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#2411717 - 12/01/17 08:27 AM Re: 1990 ram bolt pattern swap [Re: NTOLERANCE]
scratchnfotraction Offline
I Live Here

Registered: 05/29/03
Posts: 15098
Loc: Florida
yes a 82-84 d series chassis = 84 d150 front rotor or 76 new Yorker rotors = same as truck rotor 82-84

you can also use a set of 72-74 W100-W150 8 3/4 axles with the 5 on 5.5

I used a set of those axle in a 74 C-body 8 3/4 housing on a truck project once already.

are you staying with stock width truck housing? 59" flange to flange?

same as a C-body housing 59" f2f

I have 1 stock 74 8 3/4 housing left with 74 c-body 5 on 4.5 axles.

I just moved perches and installed a 67 C-body (polara) in my 85 stepside. tucked 10" rims in nicely.

what size rim tire combo you going with?

is the rear lowered on the truck?


Edited by scratchnfotraction (12/01/17 08:29 AM)

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#2412157 - 12/02/17 08:04 AM Re: 1990 ram bolt pattern swap [Re: NTOLERANCE]
NTOLERANCE Offline
master

Registered: 08/17/03
Posts: 4315
Loc: Madison Wi
Scratch. Thanks for the reply. I did some googling and confirmed the rotors that fit.

I didn't know the c body was the same width!

Truck isn't lowered. Planning to stay with the stock width.
I may lower it some but I'm not interested in slamming it.

15x10 wheels in the back. Something in the 30/31 inch tall tire that fills the wheel wells

I just got it running and the open 8.25 isn't going to cut it
I don't want c clip axles otherwise I'd go 9.25 and a Dana isn't I the budget

I figured 5x4.5 bolt pattern would open up used wheel choices too.
_________________________
I used to care but....... things have changed

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#2412488 - 12/02/17 08:42 PM Re: 1990 ram bolt pattern swap [Re: NTOLERANCE]
mgoblue9798 Offline
member

Registered: 03/16/10
Posts: 158
Loc: Atlanta, GA
Not sure about the interchange, but my 1974 d100 has 5 x 4.5 pattern on the disc brake rotors. Maybe check on rockauto.com to see if they interchange, or check to see if the inner and outer wheel bearings are the same.

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#2412997 - 12/04/17 08:43 AM Re: 1990 ram bolt pattern swap [Re: NTOLERANCE]
scratchnfotraction Offline
I Live Here

Registered: 05/29/03
Posts: 15098
Loc: Florida
IIRc some of the early trucks used a larger bearing ID/spindle and will not fit the later spindles.

seems I tried a 78 rotor on my 85 spindle and the bearing did not fit.

not sure if you can change the race/bearing in those rotors or not. I returned them to the JY and got 76 new yoker rotors.

as far as stock width goes I was able to fit 10" rim with 4" back space 29x9.50x15 on my 9 1/4 had about 3/4" - 1" at fender lip on the stepside with no need to tub bed. lowered with flip flop on the axle.

4.5 backset will fit but I could not get a craiger v5 rim with the 4.5 BS only a 4"

IMO I think you could fit up to a 11.50 on a 10" rim 4.5 backset.

I have run a 10" 4.5 bs with a 275x60x15 as well, it's most popular around here.

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