Built 4T80 (Page 1/1)
Civil JAN 07, 12:31 PM
Is there a shop that builds 4T80s to support more than 1,500hp and 2,000 ft lbs of torque?
Marty Ladwig had a 4T65HD that supposedly reliably supported 1,200hp. Does anyone know what shop built his 4T65HD?

Thank you.
Chris_narf JAN 07, 12:51 PM
I used Triple Edge Performance (which who Darth Fiero, AKA Ryan) uses to do a mild build on my 4T65eHD. I don't see anything on his site for the 4T80, but it might be a good start. I'm not sure how anyone could reliably get the 4T65eHD to 1,200 HP reliably without fracturing the case. GM also no longer produces some of the parts that are required to even get there on the 4T65eHD. I know the 4T80 is inherently stronger, but comes at the cost of added weight. Are you building a drag car?

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-Chris
'85 V6 SE 4sp (SOLD)
'88 GT - Series 3 SC3800 w/ 3.5" pulley, 1.8" rockers, 3" exhaust, 3.5" intake, 3.29 gearing. Installed and tuned by Sinister Performance
'99 Kawasaki Vulcan 500, owned since new
'09 G37x Sedan w/ Premium & Nav (wife's car)
'14 Yamaha FJR - 0-60 in 2.8s w/ 34MPG!!!

Civil JAN 07, 01:03 PM
AWD car. If the 4T80 can support the hp and torque, then the 4T80 would be mounted longitudinal. The orientation of the half shafts would function as drive shafts. Would internals have to be modified for the longitudinal application, so that the shafts rotate the same velocity?
fieroguru JAN 07, 08:07 PM
Triple Edge builds the 4T80s, for what power level, I don't know.

Do you have a source for 1:1 front and rear differentials or you planning to run 40" tires?
Civil JAN 08, 12:24 PM

quote
Originally posted by fieroguru:

Triple Edge builds the 4T80s, for what power level, I don't know.

Do you have a source for 1:1 front and rear differentials or you planning to run 40" tires?



Do you have differentials you would like to suggest? Where the front and rear wheels rotate in the correct direction.
Why 40" tires?
pmbrunelle JAN 08, 12:46 PM
You realize that differentials (including that of the 4T80) usually include a reduction of approx. 3:1, right?
Will JAN 08, 02:36 PM
The final drive gearing is built into the 4T80E... the axle outputs turn at wheel speed.

In order to use the 4T80E's axle outputs as driveshafts, they'll have to go into front/rear differentials. These differentials will dramatically reduce the speed of the shafts that are already turning at wheel speed. In order to drive this on the highway, you'd either have to go to unreasonably large tires or use very very low differential gears.
fieroguru JAN 08, 09:43 PM
As Will said...

All the applications I have seen this layout applied to are rock crawlers due to the compound gear reduction. Think of it like running in 4 low on a traditional 4x4.

The only way to keep engine RPM within the realistic range for a street car would be to have the 2nd set of differentials have something close to a 1:1 ratio, which don't exist in normal AWD automotive applications, let alone units that will support 1500 hp.

The factory transverse AWD units (transfer cases or power takeoff units) are driven off the differential within a transaxle and step up the output ratio within the transfer case the same amount as the traditional differential will step it down, so both sets of wheels turn 1:1 relative to each other. I forget what the ratio is for the F40 AWD unit, but it is somewhere in the 2-3 range, so the matching rear differential (FWD based AWD) would be in the 2-3 range as well.

What are you wanting to put this combo into and for what purpose?