Question about a 67 GMC 4speed with aux trans (twin stick) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70BLAZERX2 · 12-31-2010, 06:22 PM

Quote:

Originally Posted by Longhorn Man

wow... very interesting. Never heard of such a thing in a light duty. Is the SPID still on the glove box door?

tnblazerk5 has the cab that was on this truck , I will check it when i go there sunday.

And it also had 17.5 inch wheels on it

**Bob B.** · 01-01-2011, 12:02 AM

Wow, that is an oddball. Spicer 4 speed aux. transmissions were a common option, but only on 7500 series and larger GMC's in '67. Most likely some enterprising former owned stuck it in there. Does the transmission have model number plate on it? While we are on the subject, Warn (of winch and locking hub fame) manufactured a 2 speed aux. gearbox for manual transmission equipped GMC pickups in the late 60's. I would like to see one of those units, but I would imagine they are very rare.

factorystock · 01-01-2011, 07:48 PM

I agree with Bob B. These auxilary transmissions were found in big rigs and 10 wheel dump trucks in the 60's for heavy duty on and off road work.Not generally found in smaller light duty trucks. Is there a data plate rivited to the side of trans? Your really need this plate to figure out what you have. Spicers came in the 6000 series 7000 series and 8000 series. For example Spicer 6041 : 1st 2.14 2nd 1.24 3rd 1.00 4th .86 or Spicer 6041-A : 1st 2.14 2nd 1.24 3rd 1.00 4th .75 So the 6041 has a .86 overdrive and the 6041-A has a .75 overdrive. Other series have similar ratios, just more heavy dutier the higher the series.

70BLAZERX2 · 01-01-2011, 10:24 PM

I was on the road all day today..got a 97 gmc ex cab short bed..bad trans..and a 1988 gmc 3500 2wd with a 454 th400...And they are on my rollback right now..One on top..other on the stinger..I will have pics of it in the morning..LOL what a load..

Rollback is a stock 77 454 Th400 motorhome chassis.

The aux trans i will have to dig it out and get pics..and tag info...I will keep you updated..

70BLAZERX2 · 01-01-2011, 10:38 PM

This 67 gmc had a big alumn . box on it that said "EZ HAUL"

it was a moving van..like u=haul...but was green and silver..

01-01-2011, 12:02 AM	#2
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,395	Re: Question about a 67 GMC 4speed with aux trans (twin stick) Wow, that is an oddball. Spicer 4 speed aux. transmissions were a common option, but only on 7500 series and larger GMC's in '67. Most likely some enterprising former owned stuck it in there. Does the transmission have model number plate on it? While we are on the subject, Warn (of winch and locking hub fame) manufactured a 2 speed aux. gearbox for manual transmission equipped GMC pickups in the late 60's. I would like to see one of those units, but I would imagine they are very rare. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

01-01-2011, 07:48 PM	#3
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,400	Re: Question about a 67 GMC 4speed with aux trans (twin stick) I agree with Bob B. These auxilary transmissions were found in big rigs and 10 wheel dump trucks in the 60's for heavy duty on and off road work.Not generally found in smaller light duty trucks. Is there a data plate rivited to the side of trans? Your really need this plate to figure out what you have. Spicers came in the 6000 series 7000 series and 8000 series. For example Spicer 6041 : 1st 2.14 2nd 1.24 3rd 1.00 4th .86 or Spicer 6041-A : 1st 2.14 2nd 1.24 3rd 1.00 4th .75 So the 6041 has a .86 overdrive and the 6041-A has a .75 overdrive. Other series have similar ratios, just more heavy dutier the higher the series.

01-01-2011, 10:24 PM	#4
70BLAZERX2 Registered User Join Date: Jan 2010 Location: GREENEVILLE TENNESSEE Posts: 1,310	Re: Question about a 67 GMC 4speed with aux trans (twin stick) I was on the road all day today..got a 97 gmc ex cab short bed..bad trans..and a 1988 gmc 3500 2wd with a 454 th400...And they are on my rollback right now..One on top..other on the stinger..I will have pics of it in the morning..LOL what a load.. Rollback is a stock 77 454 Th400 motorhome chassis. The aux trans i will have to dig it out and get pics..and tag info...I will keep you updated..

01-01-2011, 10:38 PM	#5
70BLAZERX2 Registered User Join Date: Jan 2010 Location: GREENEVILLE TENNESSEE Posts: 1,310	Re: Question about a 67 GMC 4speed with aux trans (twin stick) This 67 gmc had a big alumn . box on it that said "EZ HAUL" it was a moving van..like u=haul...but was green and silver..



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