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CK5
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85 K20, the little old ladys truck.
- Thread starter The Griff
- Start date
Been trying to determine what axle gears this truck has. Luckily this is the first squarebody I've ever had that still had its RPO sheet in the glove box.
GQ1 REAR AXLE-STANDARD
G80 LOCKING DIFFERENTIAL
Everything I've rear has said GQ1 would be a standard open diff with whatever gear would have been standard in whatever particular truck, but mine has a G80.
GQ1 REAR AXLE-STANDARD
G80 LOCKING DIFFERENTIAL
Everything I've rear has said GQ1 would be a standard open diff with whatever gear would have been standard in whatever particular truck, but mine has a G80.
Jack the rear end up and spin the tire one revolution and count how many times the driveshaft spins. Or pop the cover off and count the number of teeth on the ring gear.
Post the SPID and I will tell you what it came with.
GQ1 has nothing to do with G80.
Martin
You could not get a TH350 in an '85 K20.
You have a TH400, so if that is stock, you have a C6P. A non C6P K20 would have had a TH700R4, and an LS9 350, as opposed to the LT9 350.
If your truck left the factory with a 350/TH400, then it had 4.10:1 gears.
Martin
You have a TH400, so if that is stock, you have a C6P. A non C6P K20 would have had a TH700R4, and an LS9 350, as opposed to the LT9 350.
If your truck left the factory with a 350/TH400, then it had 4.10:1 gears.
Martin
Yep, 10th digit of VIN is F for 1985
Model # is CK20903, so a long bed, fleetside K20.
C6P - 8,600 GVW (heavy 3/4 ton)
LT9 - high torque 350
MX1 - automatic transmission, non overdrive
So your GQ1 is 4.10.
GQ1 just means no optional gear ratio was selected. It does not stand for a specific ratio, like GT4 (3.73) or GT5 (4.10). An '85 C6P K20 with a 350/TH400 had no optional ratios.
Martin
Model # is CK20903, so a long bed, fleetside K20.
C6P - 8,600 GVW (heavy 3/4 ton)
LT9 - high torque 350
MX1 - automatic transmission, non overdrive
So your GQ1 is 4.10.
GQ1 just means no optional gear ratio was selected. It does not stand for a specific ratio, like GT4 (3.73) or GT5 (4.10). An '85 C6P K20 with a 350/TH400 had no optional ratios.
Martin
In the ad she said it had a TH350, but when I crawled under and looked, I saw a TH400, I assume she just repeated what she had been told and that the TH400 is original.
It is. You could not get a TH350 in an '85 K20. As you have a C6P, with MX1, it came factory with a TH400.
Martin
Sweet! I really appreciate that.
But I have another question, why would 8600# GVW truck have a semi float axle?
Learn something new everyday.
Dang, guess that explains why I see so many semi float K20s.
After much kerfuffle, initial timing is set, and it's running good.
And puking coolant out the back. Great.
O'Reillys said they'd warranty the gaskets, but I need to pull it apart again.
Also ended up with another set of lugnuts that won't work with these wheels, beginning to wonder if they still sell them, 9/16x18, 30* cone seat, and a 1" shank to sit down inside the wheel.
And puking coolant out the back. Great.
O'Reillys said they'd warranty the gaskets, but I need to pull it apart again.
Also ended up with another set of lugnuts that won't work with these wheels, beginning to wonder if they still sell them, 9/16x18, 30* cone seat, and a 1" shank to sit down inside the wheel.
Maybe get the intake pressure checked
Maybe, but I wouldn't think it would need it, it was on a running 55 Chevy last week. Only coming off because he's going LS.
Also, forgot I had this 2.5 inch Rough Country lift, I bought it for my Blazer, but the front springs were too narrow. Blazer has 3" wide springs while these are only 2.5"
I'd assume the K20 would be 3" as well, but I'm not sure, the Blazer has 3 leaves, and the K20 only has 2.
I'd assume the K20 would be 3" as well, but I'm not sure, the Blazer has 3 leaves, and the K20 only has 2.
They should bolt up, i think all the aftermarket is 2.5 with a wider bushing.
all the after market lift springs are 2.5". Be sure to use bushings that have 1/4" wide larger diameter outer edge to center spring in hanger.
Yeah tat 55 looked like it hadn't run in awhile, if it was stuck on there good could have been mistreated one never knows how good the castings are.
Yeah tat 55 looked like it hadn't run in awhile, if it was stuck on there good could have been mistreated one never knows how good the castings are.
32Pc Chrome 9/16-18 Extended Thread ET Style Lug Nut Fit Ram 2500/3500 F250/F350 | Left | Lug Nut
Lug Nut Type: Extended Thread Bulge Acorn. Lug Nut Thread Pitch: 9/16-18. If Your Wheel Has Wheel Cap that Requires to Use Lug Nut to Hold, It May Not Work . Lug Nut Seat Type: Cone Seat. Lug Nut Hex Size: 3/4".
www.ebay.com
would those work?
32Pc Chrome 9/16-18 Extended Thread ET Style Lug Nut Fit Ram 2500/3500 F250/F350 | Left | Lug Nut
Lug Nut Type: Extended Thread Bulge Acorn. Lug Nut Thread Pitch: 9/16-18. If Your Wheel Has Wheel Cap that Requires to Use Lug Nut to Hold, It May Not Work . Lug Nut Seat Type: Cone Seat. Lug Nut Hex Size: 3/4".www.ebay.com
would those work?
Unfortunately I don't think so, I think they'd need to be a little longer overall.
