75 mph in a Deuce

Jeepsinker said:

For the record, even the LDS is screaming at that speed. 70 is fine for cruising, because it is a few hundred rpm less. I wouldn't run at 75 for any length of time, but it sure brings on a smile when you see your speedometer needle pointing straight down at the floor.

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I never saw 75 mph, but it was a very smooth ride at 72 mph. Jeepsinker has on heckuva nice truck!

I got a gps verified 58.16mph with stock gearing and worn out 9.00s tires in my deuce. It was turning around 8500 rpm i think

LDT 465 D turbo, 60-62 mph @ 2100r's using a GPS for the speedo. That's where my deuce likes to run and getting 11 mpg.
pulling a 105 with 250 shack made into a camper loaded for a weeks camping.

It is kind of interesting that sometimes the truck will run faster at lower rpm, and sometimes it just wont. I guess the clutch could be slipping a bit sometimes, but I've never smelled it if that is the case.

wait how is yours 60 mph at 2100. mine was 58 at probably 2700 do you have taller tires?

drivebymashing said:

I got a gps verified 58.16mph with stock gearing and worn out 9.00s tires in my deuce. It was turning around 8500 rpm i think

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8,500 rpm ? Typo ? Or do you have one of those rare "race ready" deuces that only the upper brass got to play with ?

My Zil 131 will do 75 downhill. Not an experience for the feint of heart though lol....

8500 was a bit of an exageration. It was screaming for sure probably 2700 range.

drivebymashing said:

8500 was a bit of an exageration. It was screaming for sure probably 2700 range.

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I was hoping for a "race ready deuce" !

I was thinking about the engine out of my z06 to put in deuce 420hp 6500 rpm.

I'd think you'd need more cubes and torque

m715mike said:

I never saw 75 mph, but it was a very smooth ride at 72 mph. Jeepsinker has on heckuva nice truck!

View attachment 615729

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Things I notice about this picture:
- GPS indicated 72mph in a 1969 M35A2
- one hand on the steering wheel at the 12 o'clock position
- rain on the windshield

Surprised the safety police haven't busted your chops yet, Garrett. And I ain't asking to be deputized, but be careful out there, bud.

Garrett, glad to see you are enjoying the upgrade! Since my engine is rated 3000 rpm continuous duty I guess i should try for a record? Maybe I will just do the math, 80.82 mph with 14.5R20.

Have you hit 80 yet? My deuce is so smooth over 53mph. It wants to go much faster the engine wont let it though.

drivebymashing said:

Have you hit 80 yet? My deuce is so smooth over 53mph. It wants to go much faster the engine wont let it though.

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No...the gearing won't let it.

If the engine would turn 8 grand the gearing would be fine with that.

drivebymashing said:

If the engine would turn 8 grand the gearing would be fine with that.

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The engine could turn 8,000rpm's but the drivetrain wouldn't like it ! That Spicer 3053 would not like turning that fast at all ! Not to mention the transfer-case or drivelines or differentials ! Remember those high RPM engines are coupled to high tolerance, fine tooth, small gear transmissions with small U-joints and small differentials. The reason everything is small is they are better able to spin-up to high RPM's without coming unglued. Take a large gear, say the Rockwell "Bull" gear and spin that puppy up and see what happens ! Much more spinning mass that is not balanced for that much RPM. NOT GOOD !Can you say "bye-bye bearings" ? I knew you could.

Tom, give it a try. I don't like to run mine over on the governor for a long time, but I do sometimes run it at 2700 for hours on end.
Also, and I should've mentioned it long ago, but I found a much easier way to get both the counter shaft and mainshaft installed than using the wire and two people trick. Call me sometime and I'll explain it, I'm sure you'll add it to your instructions.