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#1 |
Senior Member
![]() Join Date: Aug 2016
Location: Loris South Carolina
Posts: 428
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Drive train help
Hi, I am in the process of building a gen 6 454 from my old work truck. That truck had a turbo 400 and a GM 14 bolt rear with 4.10 gears. My new frame came with an Eaton HO52 and I'm not sure what gears are in it but from everything I've read the most common gear size was 4.57. My question is, with the 4.10 gears and turbo 400 my old truck would cruise 70 mph at 2,300-2,500 rpm. If I get a set of 4.10 gears for the HO52 and put the same big block in the truck after building it (yes I know it will never cruise that low again after taking the rear wheel HP from 290 to 500) what would be a good 4 speed or 5 speed transmission to use for good take offs good quarter mile times (not looking for 10's just a respectable number for a pickup) and good streetability. M22, NV4500, etc etc etc. I'm still new to figuring out transmissions as I've not learned as much about them as I have about engines. Any help would be greatly appreciated. I don't want to buy the wrong transmission for the truck only to find it out once it's on the road.
Thanks, Stephen |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,615
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Re: Drive train help
You’re basing all your considerations on incorrect info.
The only way you could cruise at 2300-2500 rpm with 4.10’s is if you have 40 inch tall tires. A 500hp motor is pretty stout. Likely won’t be happy cruising under 2800 rpm. You need to figure out what gears you have and then figure out your trans. And how’s the budget? Could be up to 4 grand for the right trans. |
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#3 |
Senior Member
![]() Join Date: Aug 2016
Location: Loris South Carolina
Posts: 428
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Re: Drive train help
With the overdrive in the truck that's what it was doing on 32 inch tires. I said I know it won't be that low again and was asking about the right transmission. I checked this morning and ifi read correctly then I have an HO72 not a 52 and it already has 4.10 gears in it. Sounds like a broken shaft inside though so I'm going to have to search for a new one. Don't really want to switch everything to 14 bolt stuff if I don't have to. I will also be searching for a locker for it. But back to the main question. I'm trying to figure out what a good 4 or 5 speed transmission would be for an engine with that amount of HP. And yes 500 HP is stout but it's just scratching the surface of what that engine is capable of. Again any help would be much appreciated.
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#4 |
Senior Member
![]() Join Date: Aug 2016
Location: Loris South Carolina
Posts: 428
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Re: Drive train help
Update, the shafts are fine. So an additional question would be when I spin one tire shouldn't the other spin the opposite way if it's a limited slip?
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#5 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Drive train help
Open differentials....trans in park, both rear wheels off ground, spin one tire clockwise, other tire will spin counter clockwise....
Limited slip differential...trans in park, both rear wheels off ground, spin one tire clockwise, the other tire will spin in the same direction... Both of above assume an axle is not broken... ![]() ![]() ![]()
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox ![]() ![]() ![]() |
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#6 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,120
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Re: Drive train help
Are you saying you have a Turbo 400 with a gear vendors overdrive attached?
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#7 | |
Registered User
![]() Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Drive train help
Quote:
4l80e would solve the rpm at cruise issue
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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