Duramax Diesels Forum Truck of the Week
  #1  
Old 03-20-2017, 06:04 AM
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Cougar281 Cougar281 is offline
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Default Front Diff Lift mod

Has anyone heard of modding a front diff by cutting off the top mount for a lift kit? I got a diff this weekend to replace the one in my truck, and I didn't notice it until we were trying to shove it up into the truck, but there is no top mount. On looking, someone cut and ground the mount off, and from the looks of it, it doesn't appear to be fresh, and it wasn't obvious. We were thinking maybe it was because it came out of a gasser truck, until we noticed that it appeared to have been cut/ground.
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Old 03-20-2017, 06:07 AM
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That's what the majority of the kits have you do kinda sucks. Someone offers a bolt on bracket to fix them I just can't remember who.
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Old 03-20-2017, 06:10 AM
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I believe you have to cut it off when installing all lift kits. Just cut mine off for a zone kit. Below is a bolt on mount from DMAX store if you are still trying to put it in a stock truck

http://dmaxstore.com/products/?route...product_id=647
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Old 03-20-2017, 06:12 AM
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Pretty sure its Cognito who sells the bracket.
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Old 03-20-2017, 06:18 AM
onebaddmaxxx onebaddmaxxx is offline
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cognito sells a bracket to bolt a mount back on!
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Old 03-20-2017, 06:46 AM
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Thanks guys. Never heard of that until I saw a blurb in a car-part listing about cut off for lift kit. That is beyond stupid, IMO..... The yard is going to get me another diff that's intact.
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'04.5 2500HD Silverado LT CC/LB, LBZ D/A Dark Grey
Metallic, 05+ HD Hood & Grille, 192k and counting
Mike L Trans built by ME.
EFILive, PPE Race Valve, KD Twin Lift Pumps & Billet Fuel Pickup, MBRP 4" "Cat-Back" T409 straight piped.

300.59' 3rd place first pull

Best 1/4 times:
Truck: 14.067 @ 96.29, weighing in at over 7200#
446.4RWHP/820.2RWTq
Car (95 Cougar 4.6L V8): 14.680 @ 94.00

"The FIRST weapon is the mind, all others are incidental."
"I'd rather be judged by twelve than carried by six."
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Old 03-20-2017, 07:22 AM
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Quote:
Originally Posted by Cougar281 View Post
Thanks guys. Never heard of that until I saw a blurb in a car-part listing about cut off for lift kit. That is beyond stupid, IMO..... The yard is going to get me another diff that's intact.
its extremely common and an easy fix with the bracket. obviously if you got it from a yard id get another.

be very sure its not 4.10 gears either and i have been told that the casting for a gas front diff is not as strong as a diesel. i have not verified this myself yet though
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Old 03-20-2017, 08:46 AM
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Quote:
Originally Posted by Chevy1925 View Post
its extremely common and an easy fix with the bracket. obviously if you got it from a yard id get another.

be very sure its not 4.10 gears either and i have been told that the casting for a gas front diff is not as strong as a diesel. i have not verified this myself yet though
I can't imagine that being the case, assuming both are 9.25". I can see that as a logistical nightmare as all you'd need is one small messup at the factory and you have a run of diesel trucks with diffs that look the same but aren't as strong. Minus the missing mount, the one out of the gasser appears to be identical to the one out of my truck.
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'04.5 2500HD Silverado LT CC/LB, LBZ D/A Dark Grey
Metallic, 05+ HD Hood & Grille, 192k and counting
Mike L Trans built by ME.
EFILive, PPE Race Valve, KD Twin Lift Pumps & Billet Fuel Pickup, MBRP 4" "Cat-Back" T409 straight piped.

300.59' 3rd place first pull

Best 1/4 times:
Truck: 14.067 @ 96.29, weighing in at over 7200#
446.4RWHP/820.2RWTq
Car (95 Cougar 4.6L V8): 14.680 @ 94.00

"The FIRST weapon is the mind, all others are incidental."
"I'd rather be judged by twelve than carried by six."
Reply With Quote
  #9  
Old 03-20-2017, 09:19 AM
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Chevy1925 Chevy1925 is offline
don't know sh!t about IFS

 
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Quote:
Originally Posted by Cougar281 View Post
I can't imagine that being the case, assuming both are 9.25". I can see that as a logistical nightmare as all you'd need is one small messup at the factory and you have a run of diesel trucks with diffs that look the same but aren't as strong. Minus the missing mount, the one out of the gasser appears to be identical to the one out of my truck.
i wouldnt put it past AAM to do it. remember, our 11.5 is the same exact ring and pinion as the dodge yet the dodge axle has bigger tubes, different axle flange bolts, a limited slip we never got, and a few other differences. There are also alot more gasser 9.25 diffs over the diesel and they are not assembled on the same assembly line. the possibility is there, id just have to see the inside and outside of both cases to agree. it may not be more than just one more added casting brace or a thicker rib where the cases bolt together. little things
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02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
Tailgate Crew Member #4
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