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07-12-2014, 03:08 PM
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#1 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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4 speed transmission - 69 GMC
Anyone know the best alternative to the original 4 speed non syncro transmission bull low. Would prefer to keep factory bell housing
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07-12-2014, 03:15 PM
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#2 |
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Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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Re: 4 speed transmission - 69 GMC
What is the end result that you want? How much do you want to spend? What do you use your truck for?
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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. |
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07-12-2014, 04:09 PM
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#3 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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Re: 4 speed transmission - 69 GMC
Want to do as cost effective as possible. My 350 just seems to be wasted by the transmission. If I could re- gear the transmission, and up the rear ratio to take advantage of the horsepower and the transmission. Like to keep expenses down. I am a mechanic by trade and just want my options.
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07-12-2014, 04:12 PM
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#4 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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Re: 4 speed transmission - 69 GMC
And I also want to try to keep my survivor looking original. No adding cross members and such.
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07-12-2014, 04:52 PM
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#5 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,077
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Re: 4 speed transmission - 69 GMC
I would keep the Trans, in my opinion. The Granny Gear 1st is great for off-road and starting off with a good load on it. Of course, I would even use 1st when empty, lol.
Changing the Rear to a Higher Gear would really make the biggest difference. Unless you would go to an Over-Drive Trans, it would still be the same at 1 to 1 in the last gear. Bill
__________________
'60-'72 Chev/GMC Fan GMC 9500 Fan Detroit Diesel Fan |
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07-12-2014, 06:14 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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Re: 4 speed transmission - 69 GMC
Want to do as cost effective as possible. My 350 just seems to be wasted by the transmission. If I could re- gear the transmission, and up the rear ratio to take advantage of the horsepower and the transmission. Like to keep expenses down. I am a mechanic by trade and just want my options.
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07-12-2014, 06:19 PM
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#7 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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Re: 4 speed transmission - 69 GMC
Overdrive would be great, but all research I have seen says that overdrive conversions would require housing replacement, and adding a tenant cross member and usually the shifter does not come through the floor in the original location
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07-12-2014, 06:22 PM
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#8 |
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Registered User
Join Date: Feb 2007
Location: Beaverbank, Nova Scotia
Posts: 20
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Re: 4 speed transmission - 69 GMC
Want to do as cost effective as possible. My 350 just seems to be wasted by the transmission. If I could re- gear the transmission, and up the rear ratio to take advantage of the horsepower and the transmission. Like to keep expenses down. I am a mechanic by trade and just want my options.
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07-12-2014, 07:11 PM
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#9 | |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,077
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Re: 4 speed transmission - 69 GMC
Quote:
I went the easy route with my '72 C-10 and bought some taller tires. It seem to knock my gears from a 3.73 to about a 3.63, which made a size-able difference. Bill
__________________
'60-'72 Chev/GMC Fan GMC 9500 Fan Detroit Diesel Fan |
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07-13-2014, 12:58 AM
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#10 |
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Registered User
Join Date: Mar 2007
Location: San Pedro River, SE Arizona
Posts: 734
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Re: 4 speed transmission - 69 GMC
I think that the granny low gear setup has the same top three as others, and believe that a trans end-geared significantly different than yours would be pricey. I agree with whomever said better to change the rear gear ratio. I have a similar situation with one truck and am getting ready to install a Brown-Lipe over/under unit - have to build an added support and shorten one driveshaft - but still am going to try it.
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CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp |
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07-13-2014, 12:41 PM
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#11 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,077
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Re: 4 speed transmission - 69 GMC
I would love to go with a Brown-Lipe over/under unit in some of my trucks.
The hardest part seems to be finding one. Bill
__________________
'60-'72 Chev/GMC Fan GMC 9500 Fan Detroit Diesel Fan |
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