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#1 |
Registered User
Join Date: Aug 2005
Location: YAKIMA,WA
Posts: 22
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Lower Gear Ratio in my dually
I have a question. Has anyone every changed their gears in the rear-end of a dually to a less steep ratio. I have 4.10 in the rear of my dually. I wanna put like 3.25 or maybe 3.50. any ups or downs? I dont tow much with it, so thats not a factor for me. I want it to be a highway crusier.
Mike ![]() ALSO does anyone know what Rig I can get a non-electric 4-speed auto out of, that will bolt to my 454. thanks
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1985 Silverado Club Cab Dually ![]() ![]() Last edited by my85dually; 11-10-2005 at 02:54 AM. |
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#2 |
Registered User
Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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Re: Lower Gear Ratio in my dually
They went to the full eletronic 4 speeds in 92 or 94. All the ones before have a lock up TQ that you have to rig up somehow. And any transmission that will work on a small block will work on a big block. Just make shure that your flexplate has the correct bolt pattern.
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
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#3 |
Web Wheeler
Join Date: Jan 2000
Location: BC, Canada, eh?
Posts: 388
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Re: Lower Gear Ratio in my dually
You have a dually pickup as per your avatar?
That would be a Dana 70HD axle... you can put in a 3.54 ratio no problem. There are some odd-ball Dana 70 variants out there with numerically lower gears, (3.07 & 3.42 come to mind) but they have unique housings, so the gears won't swap. I wouldn't bother with the TH700 OD trans. Its more work (driveshaft, crossmember, cable/linkage, etc.) and your 454 will ensure its lifespan is short.
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'66 C10 longstep - Clifford equiped '84 C20 Suburban 6.2L - awaiting 4x4 conversion '91 V3500 Crewcab - awaiting diesel swap Last edited by u2slow; 11-11-2005 at 10:16 PM. |
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#4 |
Registered User
Join Date: Aug 2005
Location: YAKIMA,WA
Posts: 22
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Re: Lower Gear Ratio in my dually
Thanks for the replies! So dont worry about a 4 speed auto with the 454, ok. I will be able to buy 3.54 and install them no prob, GOOD!! I value this board because of people like you! oh and Yes that is the dually I am speaking of in my avi.
thank you very much ![]() ![]() Mike
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1985 Silverado Club Cab Dually ![]() ![]() |
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#5 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,720
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Re: Lower Gear Ratio in my dually
You can get a non computer controlled 4L80E [what comes behind big blocks from the factory from GM] and put it in there and keep your 4.10's while still saving a good 1000rpm on the freeway. Cost in the $2500-3000 range. Either that or a normal 4L80e and put the stand alone computer managment in [about $500+ the cost of the tranny]
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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#6 | |
No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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Re: Lower Gear Ratio in my dually
Quote:
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1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler |
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