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Re: Disc Brake Conversion for 49 Chev 3600
TGill #1367692 Sat Jul 04 2020 12:34 PM
Joined: Sep 2013
Posts: 1,043
M
Shop Shark
Concerning hub cap clips; the only tried and true solution I've read about is to machine or fab up spacers that go between the clip and wheel. There is a really good discussion somewhere on the site. My quick search failed to find it. This thread has good info along with a good link.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Disc Brake Conversion for 49 Chev 3600
TGill #1368005 Mon Jul 06 2020 07:02 PM
Joined: Nov 2019
Posts: 38
T
TGill Offline OP
Tbone
Moparguy-
Thanks this gives me hope I can follow LarryK's instructions (article by Smokey Culver) and get my original hub caps to fit my new 16"x8 wheels! Appreciate your help!

Re: Disc Brake Conversion for 49 Chev 3600
TGill #1370710 Sun Jul 26 2020 02:20 AM
Joined: Sep 2019
Posts: 17
T
TKM Offline
New Guy
TGill, glad to hear you have your new wheels and are pursuing the elusive task of fitting original hubcaps, keep us posted !

Re: Disc Brake Conversion for 49 Chev 3600
TGill #1371031 Tue Jul 28 2020 06:17 PM
Joined: Jul 2014
Posts: 234
1
Shop Shark
I've lost track of who has steel wheels and who is still looking. But for the record, I've been through the wheel problem. I have used 16" Ford steels with shallow enough back-spacing, 0" offset 7" Ultra alloy wheels (no longer made), 8" American alloy Ford-spec wheels and finally 0" offset, 6" wide 10-hole, alloy, trailer wheels with 8-hole mounting from Etrailer Supply. All the combos I've mentioned are 16."

8-inch wheels with the right backspacing to clear the tie rod ends will put the wheel/tire combo centerline so far outboard of the kingpin centerline that the truck becomes very hard to steer in a straight line. It will follow every pavement aberration and is very difficult to control in pavement ruts at over 40MPH. It's worse loaded. I know this from experience and it's not safe.

The factory setup was "centerpoint" steering with the wheel/tire centered on the king pin axis. This had two benefits: easier steering at slow speeds like parking and more controllable on the rough roads for which the trucks were built. The original wheel offset was about 9/16" Inboard of the centerline on the 5"" wheels. 0" makes for acceptable handling with 6" wheels but as the wheel gets wider the centerline moves outboard by half the distance of the increase. Wide tires makes the situation that much worse.

I hope this helps someone who hasn't already spent heavily on 8-hole wheels


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Disc Brake Conversion for 49 Chev 3600
TGill #1371070 Tue Jul 28 2020 10:39 PM
Joined: Jun 2011
Posts: 3,633
E
Shop Shark
I put 17" GM wheels on my Blazer front axle to get tie rod clearance.

Ed

Last edited by EdPruss; Tue Jul 28 2020 10:39 PM.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Disc Brake Conversion for 49 Chev 3600
TGill #1372217 Wed Aug 05 2020 09:44 PM
Joined: Nov 2019
Posts: 38
T
TGill Offline OP
Tbone
1Ton Tommy-
Thanks for this feedback. I've asked members on this forum for input and advise/suggestions related to converting my front drum brakes to the TSM MFG disc brake system. What's I've received and read sound promising and haven't heard of ride/handling quality issues. I'm committed to some degree as I've bought the 16x8 wheels to accommodate the 4" clear backspace requirement and waiting for the disc brake system to arrive any day.
If anyone out there has experienced the ride/quality issues Tommy is warning me about,, I'd appreciate hearing about your story. Thanks.

Re: Disc Brake Conversion for 49 Chev 3600
TGill #1374463 Sat Aug 22 2020 08:35 PM
Joined: Sep 2019
Posts: 17
T
TKM Offline
New Guy
TGill, I am planning my disc brake conversion for this coming winter. Anxious to hear how yours goes. Good luck!

Re: Disc Brake Conversion for 49 Chev 3600
TGill #1374470 Sat Aug 22 2020 09:11 PM
Joined: Jul 2014
Posts: 234
1
Shop Shark
Ed, are those modern tubeless 17" wheels? If so on what truck are they found?


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Disc Brake Conversion for 49 Chev 3600
TGill #1374473 Sat Aug 22 2020 09:19 PM
Joined: Nov 2019
Posts: 38
T
TGill Offline OP
Tbone
TKM-
I've just received my disc brake conversion kit from TSM. David is a good guy and really helpful. Shout-out to the Bolter/s who turned me his direction. I have my new 16x6 wheels and brakes. So, next steps are to go through front-end, upgrade as necessary, add new front disc brakes, check on rear brakes and make necessary repairs and then fit-up my new wheels with fresh rubber.

I'd still love to hear someone chime-in on how I can fit-up my original hub caps to my new wheels. I've ordered new clips and drilled/attached and tested how well the hub caps snap-in. Not the same as my original setup. The hub cap doesn't seat firm to the rim (rattles and worried they'll jar loose on the road). I'm going to continue to adjust to make them work. If the drilled/screwed clips don't end up working, next step might be to find someone who might help me with an insert ring/adapter.

I'll report back on my brake conversion.

Re: Disc Brake Conversion for 49 Chev 3600
TGill #1374483 Sat Aug 22 2020 10:48 PM
Joined: Jun 2011
Posts: 3,633
E
Shop Shark
1Ton,

Some GM cast wheels, don't know exactly the specs, sorry.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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