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#1 |
Registered User
Join Date: Mar 2010
Location: Eastern Shore, Maryland
Posts: 159
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Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
I have decided that I will be running a 295/40/20 on the rear. I have not yet decided on a transmission, but it will either be a 7004r or a t56 6 speed.
I plan on making this truck something I can cruise down the coast or on the power tour and not break the bank. I realize this thing won't be the most fuel efficient vehicle out there, but I want the best I can get. I plan on running my stock 307 until I get the funding to put my 327 together. Neither of these will be high horsepower engines, with the 327 probably going to be around 350. I am thinking like a 4.11 would probably suit me best? |
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#2 |
Registered User
Join Date: Dec 2012
Location: Altoona Iowa
Posts: 481
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
honestly go with the 700r4 and 3.73 posi rear. Have the trans build to auto lockup without the need of vac lines or electric. you will be much happier and easy on the bank. 4.11 is a bit much for liking when it comes to cruising.
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#3 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
If your wanting the best in the compromise as far as power and econmy go 3:42
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#4 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,115
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
if you go T56 I think the 3:73's will do what you need them to. If you go with the 700R4 the the 3:42's will give you about 22/2300 RPM's at 70MPH.
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__________________
1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#5 |
Registered User
Join Date: Mar 2010
Location: Eastern Shore, Maryland
Posts: 159
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
Just checked an online calculator. It says with a 700r4, 3.73 and a 295/40 tire my rpm at 70 would be 2097. That sounds like it's right about where I want it
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#6 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,115
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
Running the tire size you want to that sounds about right.
Posted via Mobile Device
__________________
1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#7 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
Here is what I know since I have ran both transmissions...
I would go with 3.73 with the 700 and 4.11 with the T56. I just swapped to the 4.11 and have gotten several miles but no big trips as I continue to work out the bugs but here is what I found. The obvious thing is the overdrive in the 700 vs T56 you have the double overdrive I am using the newer tranny from the ls (gen 3 ) motors and the 5th is very close to the final drive in the 700 then I dropped to .5 for 6th. This was usable on the highway but still I thought needed to change from my original 3.73. The other think I had the issues with was first gear. In my case it was taller than my 700 because the gearing is much closer 1 to 2 and 2 to 3 ... The 4.11 helped that quite a bit I didnt feel like I was in and out the clutch all the time. I get the best of both worlds with the .5 dinal drive. That said your T56 will probably have slightly different gearing and your tires are taller than mine a little. That said depending on your tranny but I dont think I would go any higher gear (lower numerically) than 3.73. Included is an excel file save thsi out and remove the .doc extension for it to work I could not upload a .xls file. See if this helps good luck Dave
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" Last edited by Custom 68; 03-05-2013 at 11:01 AM. |
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#8 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Re: Finally decided on a tire size, now to pick gear ratio for 700r4 and t56
ok so the xls file I wanted to attach is too large, it is a pretty cool program if interested pm me with an email and I will send it to you.
__________________
Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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