coachgeo
Well-known member
Do you have the 290hp engine?
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FMTV High Speed Gears
- Thread starter NDT
- Start date
expeditionnw
Member
No. 225. I will be pumping it to 290hp soon however.
scottmandu
Active member
Best forward speed I could get out of my 3126 was 75 mph going downhill. 74 was attainable on flat stretches of road.
expeditionnw
Member
I think you may be worried they dont have power for gears and tires.
the fact is, These motors feel gutless because they are wrapped wayyyy out of their powerband with too high a gear for hwy. my truck feels at 65mph, how it did at 45mph before. The shift points have smoothed out considerably. Like a real vehicle. Also 10-12mpg is a major bonus!
the fact is, These motors feel gutless because they are wrapped wayyyy out of their powerband with too high a gear for hwy. my truck feels at 65mph, how it did at 45mph before. The shift points have smoothed out considerably. Like a real vehicle. Also 10-12mpg is a major bonus!
scottmandu
Active member
What? even with the taller gears I didn't see 8mpg.
FMTV Truck Sales
Member
With 3126 we averaged 10 GPM over 1200 mile trip with high speed gears - pushing a constant 74 MPH.
coachgeo
Well-known member
You sure you don't have a 290hp engine and didn't realize it?
scottmandu
Active member
Gallons Per Mile? That is horrible.
expeditionnw
Member
Coachgeo have you ever driven a truck thats been re geared? Its a simple consideration of powerband. These engines make plenty of power.
bikeracer917
New member
I'm thinking about swapping out my gears to the high speed gears. My biggest concern is the tires. I have mvts and cold. What tires are you guys running with your high speed gears?
coachgeo
Well-known member
No have not..... Only asking cause those numbers seem a good bit out of line with what others have reported for the standard 3116 with swapped in Fast Ratio 3rds. Super sweet for you to be having such success. Just curious the total picture behind it is all.
expeditionnw
Member
My numbers are pretty inline from others ive spoken with. Mine are in a 1078. I was getting 5-6mpg prior.
The old gears will kill these trucks at hwy speeds. Here is a photo of my gps showing 74 vs the tach. Ive hit 76mph but didnt get a photo with the tach.
The old gears will kill these trucks at hwy speeds. Here is a photo of my gps showing 74 vs the tach. Ive hit 76mph but didnt get a photo with the tach.
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fjdedrick
Member
Hey guys..I've lurked here for about a month. I'm picking up my first M1079 mid Feb .
After reading countless threads this seems to to be the must have upgrade. Any High SPeed Caiman GEars in the North West Ohio Area?
I'm plopping down a fortune for the truck, looking for a reasonable gear set.
After reading countless threads this seems to to be the must have upgrade. Any High SPeed Caiman GEars in the North West Ohio Area?
I'm plopping down a fortune for the truck, looking for a reasonable gear set.
Depending in who you get them from a pair will be ~1,100-1,400. Very reasonable.
fjdedrick
Member
Hello Justin,
Was Centramatic able to make you some balancers? I actually just spoke with a Jerry there this week--spent an hour on the phone with him. Super nice guy, and super helpful, but at the end of the call he still didn't think they had anything that would work...
The fronts are bolt Ins. The rears are not but the chunk can be exchanged into your existing axle quite easily. If these are the correct part numbers. I can't get to mine to verify.
wandering neurons
Active member
I'm thinking that these are for something much bigger than an LMTV, like HEMMT or MK48. I'm basing that on the upper steering arms each having a pivot, not just the left side like the LMTV. Also, the center chunk is offset to the wrong side and "flatter" top and bottom, LMTV chunk is more rounded.