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#1 |
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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2.75 Gears in a 2wd: Driveable?
I just got my truck back together and driving again. While apart I installed a Ford 9" rearend so I could run different offset rear wheels. When I had the third member out for inspection [sorry about all the Ford talk] I thought it was geared at 3.55, but now that I have driven it I know it has 4.10s which I thought was cool for about 10 minutes until I drove down the highway at 3,400 rpm just to keep up with traffic.
I have another 9" with 2.75s that I could pop in. Do you think the truck will drive ok with 2.75s and my 28.5" tires? My 350 is mild but fresh, and I don't need to drag race, just wanna cruise. Tranny is TH350. So you think the gears would work or will the truck be so slow just getting around that I will hate it? |
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#2 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: 2.75 Gears in a 2wd: Driveable?
Should work just fine. It just will not do a full block burn-out--just a 1/2 block.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#3 |
On the fast track to nowhere..
Join Date: May 2006
Location: Splendora, Texas
Posts: 5,316
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Re: 2.75 Gears in a 2wd: Driveable?
I had a mild carbed 350 in my 88 short Chevy. Trans was a 5speed but that shouldn't make much difference. It had a 2.73:1 gear and there are folks that still talk about how quick it was. Not to mention downshifting to third at 80mph and leaving like a rocket
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-Mike Owen- Norwood, Houston, Cecilia, Jackson, Monroe and counting |
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#4 | |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: 2.75 Gears in a 2wd: Driveable?
Quote:
![]() My "Firechicken" had the same gear ratio, pretty quick off the line, but from 80 to 140 it was like a jet plane. Man that car was fun ![]()
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#5 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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Re: 2.75 Gears in a 2wd: Driveable?
some of the trucks in the 80s had 2.73's even had somene tell me of one with 2.56. Highway runners. not bad for cruisers
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Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing. |
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#6 |
Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Re: 2.75 Gears in a 2wd: Driveable?
How do you tell you have 4:10's just by driving?
Oh & my truck has 3:07 gears, not a whole lot different. I think you will be fine with yours. Easy to change them in a 9" so you can swap them back and forth often if you get bored. ![]() Last edited by corn; 07-25-2007 at 06:21 PM. |
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#7 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: 2.75 Gears in a 2wd: Driveable?
I had 3.08s when I first put in my 700r4. It ran OK but kind of a dog on the highway. Now with 3.73s its very comfortable. That gives a final drive ratio of 2.61 so I think you should be ok
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#8 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: 2.75 Gears in a 2wd: Driveable?
I think it will be a dog. I had 3.08 with 33" tires once,with a very potent RV cammed 350 and a 465 truck 4spd and it really only had one good gear,2nd (3.58-1) then the shift to 3d....... end of fun. 1800 RPM at 60 in 4th. Ended up getting 10 MPG freeway,which really sucked. I don't think you'll be happy with it (the 2.75).
I say put some 33s in back and get your RPMs down AND get that sporty raked look. ![]()
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 2.75 Gears in a 2wd: Driveable?
It's right on the fence... might be too low, might not.
Pop it in and see what happens. You can always use one of the two as trading barter. |
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#10 |
Senior Member
Join Date: Feb 2004
Location: Ponca city now kingfisher Oklahoma
Posts: 1,221
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Re: 2.75 Gears in a 2wd: Driveable?
--------------------------------------------------------------------------------
I think it will be a dog. I had 3.08 with 33" tires once,with a very potent RV cammed 350 and a 465 truck 4spd and it really only had one good gear,2nd (3.58-1) then the shift to 3d....... end of fun. 1800 RPM at 60 in 4th. Ended up getting 10 MPG freeway,which really sucked. I don't think you'll be happy with it (the 2.75). I say put some 33s in back and get your RPMs down AND get that sporty raked look. __________________ thats comparing apples to oranges, 33in compared to 28 in tall tires, It wont be a hot rod but I bet he likes it if he cruises the highway
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Even the nicest dodge-chrysler is only 2years away from being parked outside of Section 8 housing. |
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#11 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 2.75 Gears in a 2wd: Driveable?
I had 3.07's with 10 inch wide 28 inch tall tires in this truck;
It still haulled ass. nothing but a cammed out 8 to1 comp 350. |
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#12 |
Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: 2.75 Gears in a 2wd: Driveable?
You'll probably be OK with it. I have 2.73's in a '79 Suburban with a stock 350, and it's kinda doggy, what with probably 3/4-ton more weight than you have, but it's not totally undriveable, it's just kinda slow. But gas mileage increased a whopping 10% over the 3.08's, up to an amazing 11mpg.
I had 33" mud grips on my '69 SWB years ago, with an also stock 350 and what I believe are 3.07's, and it was very driveable and quicker than it looked. |
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#13 | ||||
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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Re: 2.75 Gears in a 2wd: Driveable?
Quote:
Quote:
Quote:
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![]() I will clean up the other rear end, pull the carrier, throw it in and see how it drives! |
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#14 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: 2.75 Gears in a 2wd: Driveable?
oh yeah, I picked up fuel mileage when I switched from 3.08s to 3.73s....14 to 16 mpg
BTW, my corvette cruises down the highway at 60mph at 1400RPMS!!! |
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#15 |
Nothings as cool as my 72
Join Date: May 2005
Location: Edmonton, AB, Kanuckastan
Posts: 181
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Re: 2.75 Gears in a 2wd: Driveable?
I wonder what the 3.42 gears in my truck would be like going down the highway. Plus who cruise down the highway at 60, 70-80 man, i got a heavy right foot.
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1972 C10 Longbox In the middle of body off restoration Rebuilt 355, turbo 400, 3.42 12-bolt Rolling chassis finally done and cab mounted. Now onto sanding, bondo and more sanding. ![]() |
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#16 |
Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Re: 2.75 Gears in a 2wd: Driveable?
My 01 GMC Sierra has 3.42s and its 2grand at 75. That is with the overdrive though.
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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#17 |
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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Re: 2.75 Gears in a 2wd: Driveable?
Yea, my 02 Sierra has 4.10s, so I drove around in third for awhile to see if the rpms at speed matched what my 67 is doing, and its real similiar.
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#18 | |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: 2.75 Gears in a 2wd: Driveable?
Ackattack says:
Quote:
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 07-26-2007 at 06:52 PM. Reason: spelling gafe |
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#19 |
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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I swapped in those 2.75s and the truck is so much nicer to drive on the highway. I did lose some off the line, but less than I expected. It is a total cruiser now, but that is what I intended to build, so I am way happy.
![]() I recounted the gear set that I had in before which I thought were 4.10s, well they were 3.50s... sooo I think my truck stock must have had 3.07 gears, because the 3.50s in the 9" we not good on the highway and the truck did cruise nicely before with the 12 bolt, so that's my theory anyhoo... |
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#20 |
I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: 2.75 Gears in a 2wd: Driveable?
Good choice, I would of done the same thing. A friend of mine has a 77 ford f 150 with a 468bbc and a 700r4 and his had 2.75's in it but he swapped to 3.50 and his runs great but that's only because he had the 700r4. BTW, that truck is f&^#ing fast.
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig ![]() 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! ![]() 1979 Ford F150 4x4 SWB Built Ford Tough!!! ![]() 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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#21 |
Registered User
Join Date: Mar 2007
Location: Estevan, Sask, Canada
Posts: 185
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Re: 2.75 Gears in a 2wd: Driveable?
Lots of good opinions here....my .02...if its a cruiser and you are not looking for tire smoking performance it will work great. If you are more interested in the performance side and not about saving gas and just getting from point A to B then you will probably not be real impressed.
Had this same set-up in a 75 olds cutlass...no real impressive off the line but would hold first to 50 MPH and shift into third at 80mph. Anything over 25 MPH it was fun. |
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#22 |
Registered User
Join Date: Dec 2006
Location: Virginia
Posts: 118
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Re: 2.75 Gears in a 2wd: Driveable?
Its a 9 inch, so it shouldn't be a problem to just swap them in and try them out. You will probably be happy with the ratio for what you want it for. If not it shouldn't be hard to find someone to trade you a better gear for your 4.10s
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www.fatdaddieshotrods.com |
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#23 |
Senior Member
Join Date: Apr 2007
Location: East Texas
Posts: 549
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Re: 2.75 Gears in a 2wd: Driveable?
my dads 72 sprint (gmc's version of the elcamino) had 273's in it when he got it, it still had power and would still light the tires.hope that helps
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Justin 1970 c/10 short wide bed WTT 1970 chevy front end for 67/68 chevy front end WTT 2 15x10 american racing outlaw 2 wheels for 2 of the same in a 15x7 or 15x8
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