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Username Post: Got a new rear end now what?        (Topic#357998)
JCray520 
Poster
Posts: 6

Age: 36
Loc: Tucson AZ
Reg: 09-04-19
09-09-19 01:16 PM - Post#2775159    

Hey guys, I got a rear axle assembly and am going to swap out the whole thing. What do I do? What don't i do? The new rear assembly has disk brakes and came from a little later model but it is the same width and the same gear ratio. I have a 95 k 1500 6 lug rear end (43:11) 3.73



 
junkman104 
Frequent Contributor
Posts: 1526
junkman104
Age: 61
Loc: Murphy N.C.
Reg: 01-25-14
09-09-19 05:05 PM - Post#2775185    
    In response to JCray520

Sell it and get the correct rear. Disc brake started in 99.



 
scrambldcj8 
"2nd Year" Silver Supporting Member
Posts: 2572
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
09-10-19 04:59 PM - Post#2775280    
    In response to junkman104

GM never offered 3.90(1):1



 
junkman104 
Frequent Contributor
Posts: 1526
junkman104
Age: 61
Loc: Murphy N.C.
Reg: 01-25-14
09-10-19 05:53 PM - Post#2775286    
    In response to scrambldcj8

Huh?



 
65_Impala 
Very Senior Member
Posts: 4504

Reg: 12-29-02
09-10-19 06:08 PM - Post#2775288    
    In response to junkman104

43:11 is 3.91:1 gear ratio.



 
scrambldcj8 
"2nd Year" Silver Supporting Member
Posts: 2572
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
09-10-19 06:46 PM - Post#2775290    
    In response to junkman104

Sorry to confuse....reply was meant to OP

So, in align with your original post....DO NOT install front driveshaft....



 
scrambldcj8 
"2nd Year" Silver Supporting Member
Posts: 2572
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
09-12-19 06:14 PM - Post#2775418    
    In response to scrambldcj8

You say same ratio, so I think you meant 41:11

OK, so the new rear came from what truck "a little later model"? And was it from an SUV or P/U (and same 1/2T or other tonnage) as the spring perch spacing may have changed or be different...I forget what if any changes to spring perches might be with newer trucks. That info is important as you would like to get that corrected before sliding it under the truck, only to find out you need to torch a few things.

Another item would be E-brake cables and if they're going to need to be changed or adapted.

What U-joint does it call for compared to your truck now (95 K1500).

Is the rear complete hub to hub with brakes and flex/hard lines ready to attach to your chassis flex (drop) line? Or do the lines to be re-routed to line up? What is the condition of the brakes...pads/rotors, and etc?



 
JCray520 
Poster
Posts: 6

Age: 36
Loc: Tucson AZ
Reg: 09-04-19
09-13-19 11:47 AM - Post#2775463    
    In response to scrambldcj8

Hey thanks for the response, it is a complete setup. I believe it was from a 2003 half ton pickup short bed. Shock mount points look a little more narrow but they do match up they do have disk brakes rather than drums but I ran new brake line and the e-brake cables are fine



 
scrambldcj8 
"2nd Year" Silver Supporting Member
Posts: 2572
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
09-15-19 04:15 AM - Post#2775545    
    In response to JCray520

Great, now go install and report back.

One thing which may pop up, would be a mismatch with the master cyl and/or proportioning valve. Yours being disk/drum going to disk/disk. Drums used to use some form of residual valve to keep the shoes from retracting too far from the drum each time you let off the pedal. I am not sure how that applies on the newer vehicles.

I might assume you'd have to change the master and possibly the proportioning valve (AKA: combination valve). The GMT800 (non-hyd. boost 3/4T )master cylinder is a popular swap anyway into GMT400trucks, along with the HD 3/4-1T front brake calipers.

https://www.gmt400.com/threads/swap-upgrades -to-fr...

And this one:
http://www.pacificp.com/forum/viewtopic.php?t=1079...

Hell, if you have it apart you mine as well go all out and bleed once.



 
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