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Looking to do a gear swap what axles do i have ?

I looked his site over not much help i got the 14T rear but it could any of the 2 fronts how do i find out for sure ?

Mike
 
I'm almost positive that you have the 9.25" front end. The light duty six-lug 2500s would've had the smaller one, 8.5" or whatever it is. There is a picture of the two on Randy's site can't you tell by that?
 
Not really cause almost all of them GM front ends visually look the same for the most part. . .

Mike
 
I'm getting told to watch my Water temp after the gear swap as the 6.5-T might heat up after a few seconds of turning the higher Revs ?

Mikey
 
Well its got the 14t rear so worst case i order the Rea set of gears and drop the front drive shaft. . .
Then i can worrie about the Fricken front axle at another time. . .

Mikey
 
have you tried taking the VIN to a dealership and see if they can tell you what front axle it came with? Worth a try at least.
 
Welp that sucked they didn't have a clue what i was talking about. . .
is there and online place for decoding this Rig ?

Mikey
 
Mikey, have you called Randy's Ring & Pinion to see if they can clarify for you? I would think that the higher GVWR 2500s with 8 lug wheels have the 9.25" differential where the light duty 2500s with 6 lug wheels have the 8.25" differential.
 
No i haven't called them no i just looked around i have 8 lug axles yes, dose this mean it can only have the Bigger axle ?

Mikey
 
Oh another thing will there need to be anything done to the trans for the gear swap ?

Mikey
 
Your transmission should be fine after a gear swap, assuming it's in good working condition already. A fluid/filter service can't hurt.

Since everyone has helped you determine that you indeed have a 10.5" 14bolt full floating rear axle, here is how we can help determine what front axle you have. Your rear axle is production option 1TA.

Check your glovebox, and see if you still have the RPO sticker in there.

You will need to look for production option C6P, which is 8,600 GVW. This produciton option gives you the larger 9.25" front diff, 9.5" rear diff (which can be upgraded with the 10.5" full floater option 1TA) and 6-leaf rear springs.
 
actually my door says my GVWR is 8600LB's. so then it its got both big axles.
and yes a fluid and filter change is going to be done as well. . .it looks good but i change them before they look bad. . .

Mike
 
Yeah i'd be dead surprised to see a 8-lug with the 8.25" axle up front. The 9.25" was used across the board with 8-lug trucks, IIRC. You can also see that your front axle has a wide stance, the 9.25" front sits wider than it's 6-lug brothers.
 
Great. . .Now i can start operation gear down. . .I'll get my acceleration one way or the other. . .

Mikey
 
how do i go about correcting the speedo ?
what sort of unit/tool ect will i need ?

My REPO's:
ttp://www.thedieselgarage.com/forums/showpost.php?p=719456&postcount=3

Now can you tell me what it has for gears now ?


Mikey
 
Last edited:
VIN : 1GTGK24F5SE522681
VEHICLE INFORMATION
Merchandising Model : TK20903 Warranty Start Date : 11/17/1995
BARS Order Type : 0 - ALL ORDER TYPES (FOR WFP USE)
Delivering Dealer : CARLSON S PONTIAC-CADILLAC-OLDSMOBILE-GMC TRUCK, INC.
1355 E MAIN ST
REEDSBURG , WI 53959-1451
(608) 524-2358
Selling Source : 48 - GMC TRUCK
Site Code : 26154
Business Associate Code : 116110
Service Contract :

No

Branded Title :

No

Warranty Block :

No

PDI Status :

Paid
REQUIRED FIELD ACTIONS
Type

Number

Description

Posted Date

Status
RC
03023
WINDSHIELD WIPER MOTOR FAILURES
05/20/2003

Open
SERVICE INFORMATIONAL ITEMS
Vehicle Has No Current Record Of Outstanding Service Information
ON STAR AND XM SATELLITE RADIO INFORMATION
Vehicle Has No Associated On Star or XM Radio Information.
APPLICABLE WARRANTIES
Description

Effective Date

Effective Odometer

End Date

End Odometer
36/36000 BUMPER TO BUMPER LIMITED WARRANTY
11/17/1995
392 miles
11/17/1998
36392 miles
72/100000 SHEET METAL COVERAGE RUST THROUGH LIMITED WARRANTY
11/17/1995
392 miles
11/17/2001
100392 miles
96/80000 FEDERAL EMISSION CATALYTIC CONV. AND PCM
11/17/1995
392 miles
11/17/2003
80392 miles
60/100000 FEDERAL EMISSION
11/17/1995
392 miles
11/17/2000
100392 miles
60/100000 GM DIESEL ENG IN LD VEH WITH $100 DEDUCT AFTER BUMPER TO BUMPER LIMITED WARRANTY ($ 100 DEDUCTIBLE)
11/17/1995
392 miles
11/17/2000
100392 miles
CLAIM HISTORY
Vehicle Has No Associated Claim History
CHECK HISTORY INFORMATION
Vehicle Has No Associated Check History Information.

? 1998-2005 General Motors Corporation. All Rights Reserved.
GM Vehicle Inquiry System
Vehicle Build


Home - Summary - Claim History - Vehicle Build - Vehicle Component - Delivery Information - Dealer Information - Service Contract - Warranty Block - Branded Title

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VIN 1GTGK24F5SE522681
VEHICLE BUILD
Merchandising Model : TK20903
Gross Vehicle Weight Rating : 3904 kg (8608 lb) Order Number : B87670
Build Date : 03/21/1995 Build Plant : 1SE03
GMVIS is not the definitive source of GM Vehicle RPO information and is intended for service reference only. Should there be any questions about the vehicle's original build or RPO information please refer to the original vehicle invoice or window sticker.
OPTION CODES
#SP AE7
AU0 AU3
A31 BZY
B32 B71
B85 C6P
C60 DE2
E63 FE9
FF6 FF7
GMC GT5
G80 JD7
KNP K34
K60 L65
MT1 NA5
NP5 NZZ
N33 P06
R6F R9B
SLM TFE
UM6 UQ5
VB3 VG3
VK3 VXS
V22 V27
V73 XGK
YD3 YD6
YE9 YGK
ZGK ZQ2
ZQ3 ZY1
Z88 1SC
1SZ 209
43U 6GK
64D 64I
7GK

This is all i could get for info on this truck. . .
The Ring and pinion dealer needs to know what axles and what Grea ratio i have now to get the right set of 4.56 gears. . .

Mike
 
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