What have you done to your square lately??

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

C10MixMaster

Full Access Member
Joined
Dec 6, 2016
Posts
756
Reaction score
1,420
Location
Kingman AZ
First Name
Ben
Truck Year
1977
Truck Model
C10 BIG10
Engine Size
ZZ4 350
Weighed it today. 4245# with me and both tanks full. ~3865# dry weight
 

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
3,932
Reaction score
6,385
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
The later ones called for ATF. I'm not sure if running ATF in an older one would cause problems though.

The seals did not like it - I tried it when I 1st got the truck as I did not have a owner's manual, but have a 82 FSM which called for ATF.

Unknowingly I bought synthetic ATF which may have been what it did not like.

That said, any ideas if the overfull condition would cause it to make funny sounds only at a certain rpm and above?

I will find out Saturday morning, but if anyone knows the answer before then, cool.
 

Poppy 87

Full Access Member
Joined
Oct 19, 2019
Posts
1,074
Reaction score
1,923
Location
Bloomingdale GA
First Name
John
Truck Year
1987
Truck Model
R10 Silverado
Engine Size
305
I don't think an overfill condition in a gear driven t-case would cause noise, probably only leaks. It's "splash" lubricated like the differential, no pump to cavitate or surge.

Sent from my XT1254 using Tapatalk
 

80BrownK10

Full Access Member
Joined
Oct 22, 2019
Posts
1,878
Reaction score
1,240
Location
Greenwood, SC
First Name
Nate
Truck Year
1980
Truck Model
K10
Engine Size
350
I may be wrong, but I don't think the np205 takes atf, but gear oil. In which case, the mixing of the two may be problematic.
Your correct. The 205 just takes gear oil. That said I have heard some run ATF. But also it's just gears and bearings and I don't think his normal running so far would have hurt it. No oil would be worse that half and half over full
 

80BrownK10

Full Access Member
Joined
Oct 22, 2019
Posts
1,878
Reaction score
1,240
Location
Greenwood, SC
First Name
Nate
Truck Year
1980
Truck Model
K10
Engine Size
350
I'll be pulling them off of the Suburban at some point. One has a little rust on it though.
Are y'all talking about the bumperettes? Those things on the front bumper that protect it from an forward impact?
 

78C10BigTen

Full Access Member
Joined
Apr 12, 2017
Posts
15,573
Reaction score
23,963
Location
pennsylvannia
First Name
Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
Spent 8 hours saturday doin a rear swap and conversion.

You must be registered for see images attach


You must be registered for see images attach


You must be registered for see images attach
Hey @eskimomann209 this was the last time. This is when i killed the factory 12 bolt and built the 10 that i just cooked.
 

bucket

Super Moderator
Staff member
Super Moderator
Joined
Aug 3, 2010
Posts
29,087
Reaction score
23,882
Location
Usually not in Ohio
First Name
Andy
Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
Are y'all talking about the bumperettes? Those things on the front bumper that protect it from an forward impact?

Yeah. They have gained the nickname around here as "bumper thingies".
 

eskimomann209

Full Access Member
Joined
Jan 9, 2019
Posts
1,849
Reaction score
2,000
Location
Modesto
First Name
Marcus
Truck Year
1973
Truck Model
C10
Engine Size
5.3
Hey @eskimomann209 this was the last time. This is when i killed the factory 12 bolt and built the 10 that i just cooked.
Ohhhh got it. That’s rough.. just a gear swap or just a posi swap?
I know people say that it’s ok to swap the ring onto the new carrier but sometimes it’s better to take that little extra time ( and money ) to knock it all out. Usually if I plan on keeping something old, I spend a lot of time inspecting. And if I feel slightly nervous I swap it out.
Cheaper to spend money on a new crush sleeve to inspect the pinion bearings VS a whole rebuild. But I’m a wiggly one. I’m no rear end expert but I have rebuilt a lot of gear boxes in industrial settings.
 
Last edited:

78C10BigTen

Full Access Member
Joined
Apr 12, 2017
Posts
15,573
Reaction score
23,963
Location
pennsylvannia
First Name
Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
Ohhhh got it. That’s rough.. just a gear swap or just a posi swap?
I know people say that it’s ok to swap the ring onto the new carrier but sometimes it’s better to take that little extra time ( and money ) to knock it all out. Usually if I plan on keeping something old, I spend a lot of time inspecting. And if I feel slightly nervous I swap it out.
Cheaper to spend money on a new crush sleeve to inspect the pinion bearings VS a whole rebuild. But I’m a wiggly one. I’m no rear end expert but I have rebuilt a lot of gear boxes in industrial settings.
Old rear was a 3.08 new one was a 3.42. I left the 3.42 pinion alone and just put the ring on the new posi and put it all in
 

TubeTruck

I'm from Boston. Deal with it.
Joined
Sep 4, 2019
Posts
1,417
Reaction score
2,160
Location
East TN
First Name
Denis
Truck Year
1978
Truck Model
Suburban K10
Engine Size
LQ9
Old rear was a 3.08 new one was a 3.42. I left the 3.42 pinion alone and just put the ring on the new posi and put it all in

Get a 12 bolt out of a 4x4 with 6 lugs and make a Lincoln locker. You'll love it :burnout:
 

TubeTruck

I'm from Boston. Deal with it.
Joined
Sep 4, 2019
Posts
1,417
Reaction score
2,160
Location
East TN
First Name
Denis
Truck Year
1978
Truck Model
Suburban K10
Engine Size
LQ9
For a daily driver!!??:gathering:

It all depends on someone's tolerance. Personally, I love having locked axles. Some people hate it. Just like some people like manual hubs and some like drive slugs or auto hubs.
 

78C10BigTen

Full Access Member
Joined
Apr 12, 2017
Posts
15,573
Reaction score
23,963
Location
pennsylvannia
First Name
Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
I like this eaton clutch posi i have but i dont think id hate constant 2 wheels pushin
 

Goldie Driver

Full Access Member
Joined
Mar 19, 2018
Posts
3,932
Reaction score
6,385
Location
Houston, Texas
First Name
Britt
Truck Year
1980
Truck Model
GMC K1500 Suburban
Engine Size
350
I don't think an overfill condition in a gear driven t-case would cause noise, probably only leaks. It's "splash" lubricated like the differential, no pump to cavitate or surge.

Sent from my XT1254 using Tapatalk

Sadly, you were correct- the overfull was not the source of the noise.

Would have been too easy...

:p
 

Forum statistics

Threads
42,065
Posts
908,320
Members
33,542
Latest member
willyg
Top