What's the deal on 70 4x4s and front brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Davetopay · 10-09-2009, 07:26 PM

All I can find listed is parts for drums. I have discs. Now I am wondering if I have a swapped setup from an old owner. I have had people tell me that it was an option in 70, and some have told me it wasn't. Any help?

If it was a legit option, does anyone know what part numbers I should be looking for when doing a pad job?

koolky · 10-09-2009, 07:51 PM

Discs came in 1971. Either the front axle has been swaped or the vin has been changed. I dont think it was an option, last thing i can think of is that the truck was made in late 1970 and somehow got a 1971 drivetrain...

71swb4x4 · 10-09-2009, 08:01 PM

Probably 71-72 front brakes but you should probably verify it before ordering parts. Since something non-stock was swapped in you will want to make sure it's not from something other than a 71/72.

Davetopay · 10-09-2009, 08:07 PM

Quote:

Originally Posted by koolky

Discs came in 1971. Either the front axle has been swaped or the vin has been changed. I dont think it was an option, last thing i can think of is that the truck was made in late 1970 and somehow got a 1971 drivetrain...

That has all gone through my head. If I still had the option sheet decal in the glove box, I'd be golden, but no dice. I am thinking I'll start with some 71 parts and compare them.

**too much stuff** · 10-09-2009, 08:12 PM

Discs were standard in 71. It wouldn't be listed on the option sheet since it was standard. Alot of people do the upgrade since so many years of front ends bolt in.

Davetopay · 10-09-2009, 08:29 PM

Quote:

Originally Posted by too much stuff

Discs were standard in 71. It wouldn't be listed on the option sheet since it was standard. Alot of people do the upgrade since so many years of front ends bolt in.

I guess I'll start by decoding the BOM numbers on the axle tube to try and ID the axle.

jeffspower · 10-09-2009, 09:41 PM

It may be an axle swap, or just a "knuckle out" swap. You can convert the '70 axle to discs by swapping the knuckle and all the outward parts. So... you could have a hybrid. I learned alot of the details doing a complete axle swap on my '68 last month. All kinds of differences in hoses, lines, proportional valves, master cylinders, etc. Pictures of all this stuff would go along way in helping you out.

Davetopay · 10-09-2009, 10:36 PM

The master cyl is not one I recognize, but the prop valve looks to have been replaced more recently than most parts and looks like the later version available in the LMC catalog. I'd be willing to bet it was a knuckle out swap. The brake hoses are fairly recent as well.

I'll try and get some pics this weekend to see what I can dig up for comparison.

cjthor · 10-15-2009, 12:36 AM

Post a pic of said disc brakes!

*2tons of fun* · 10-15-2009, 02:01 AM

ever think of trying a set from the other 21 years that disc brakes were used???????

they are all the same. 2wd 4wd 1/2-3/4. d44 or 10b. calipers vari slightly with piston bore and outer castings but they will all use the same pad.

Davetopay · 10-15-2009, 06:35 AM

Quote:

Originally Posted by 2tons of fun

ever think of trying a set from the other 21 years that disc brakes were used???????

they are all the same. 2wd 4wd 1/2-3/4. d44 or 10b. calipers vari slightly with piston bore and outer castings but they will all use the same pad.

See, THAT is some useful information!

Yes, this is the FIRST GM product of any kind I have ever owned.

10-09-2009, 07:26 PM	#1
Davetopay Registered User Join Date: Oct 2009 Location: Leesburg, VA Posts: 424	What's the deal on 70 4x4s and front brakes? All I can find listed is parts for drums. I have discs. Now I am wondering if I have a swapped setup from an old owner. I have had people tell me that it was an option in 70, and some have told me it wasn't. Any help? If it was a legit option, does anyone know what part numbers I should be looking for when doing a pad job?

10-09-2009, 07:51 PM	#2
koolky 67-72 Addicted Join Date: Oct 2007 Location: Guelph Ontario Posts: 256	Re: What's the deal on 70 4x4s and front brakes? Discs came in 1971. Either the front axle has been swaped or the vin has been changed. I dont think it was an option, last thing i can think of is that the truck was made in late 1970 and somehow got a 1971 drivetrain...

10-09-2009, 08:01 PM	#3
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: What's the deal on 70 4x4s and front brakes? Probably 71-72 front brakes but you should probably verify it before ordering parts. Since something non-stock was swapped in you will want to make sure it's not from something other than a 71/72. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

10-09-2009, 08:12 PM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,786	Re: What's the deal on 70 4x4s and front brakes? Discs were standard in 71. It wouldn't be listed on the option sheet since it was standard. Alot of people do the upgrade since so many years of front ends bolt in. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

10-09-2009, 09:41 PM	#7
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: What's the deal on 70 4x4s and front brakes? It may be an axle swap, or just a "knuckle out" swap. You can convert the '70 axle to discs by swapping the knuckle and all the outward parts. So... you could have a hybrid. I learned alot of the details doing a complete axle swap on my '68 last month. All kinds of differences in hoses, lines, proportional valves, master cylinders, etc. Pictures of all this stuff would go along way in helping you out. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

10-09-2009, 10:36 PM	#8
Davetopay Registered User Join Date: Oct 2009 Location: Leesburg, VA Posts: 424	Re: What's the deal on 70 4x4s and front brakes? The master cyl is not one I recognize, but the prop valve looks to have been replaced more recently than most parts and looks like the later version available in the LMC catalog. I'd be willing to bet it was a knuckle out swap. The brake hoses are fairly recent as well. I'll try and get some pics this weekend to see what I can dig up for comparison.

10-15-2009, 12:36 AM	#9
cjthor Registered User Join Date: Sep 2009 Location: Damascus OR Posts: 24	Re: What's the deal on 70 4x4s and front brakes? Post a pic of said disc brakes! __________________ JP 70 K20 74 CJ5

10-15-2009, 02:01 AM	#10
2tons of fun Account Suspended Join Date: Jan 2009 Location: galt ca, Posts: 749	Re: What's the deal on 70 4x4s and front brakes? ever think of trying a set from the other 21 years that disc brakes were used??????? they are all the same. 2wd 4wd 1/2-3/4. d44 or 10b. calipers vari slightly with piston bore and outer castings but they will all use the same pad.



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