69 m35a2 wont go over 20

[Chases7885]

I just bought my first deuce a year ago and have been fixing it and trying to get it running down the road. Yesterday my dad decided to take it out for the first time on the street and he said he couldn't get it over 20 mph. So I was wondering if anyone might know of a reason or something that I should check to fix this problem ?

 

[hndrsonj]

transfer case in low??

 

[theeDIZ]

Does he know it's a strange shift pattern ? And like above make sure transfer is in up position!

 

[nk14zp]

Can he shift?

 

[MWMULES]

Parking brake can do it also, if it's none of the above then fuel filters.

 

[FloridaAKM]

Only 20 mph, he must be going up a very steep incline; or it is some of the above stated problems. Keep digging till you find the problem!

 

[Chases7885]

Checked the transfer case it's in high and the road he took it down is a flat road, and my truck has the shift pattern on the dash the only thing I haven't checked is the filters. Thanks for all the replies guys. I hope the filters are the problem

 

[FloridaAKM]

Check the water separater under the right fender with the drain to see if you get anything but a good flow of clean fuel! Then check the other big filters up on the fire wall with the drains on them. If you get water or dirt in any of them, or a low flow, it might be time for a filter change starting with the water separator first! Let us know what you find...

 

[m109a2]

20 mph how many rpms?

 

[dmetalmiki]

That.s going to be filters most likely, change them all and if that does not fix the problem, you have to read the applicable T.M.s and set the feul pump properly.

 

[frank8003]

What does it do if you run fuel right to the FDC/hydraulic head interface fitting?
Bypass EVERYTHING using known good clean fuel and comeback.
Put it into here

Anyhow you need to post pictures for the General.
There is no one on SS that does not want your engine to run good........................

 

[CARNAC]

What is your rpm at 20mph?????

Is then engine running rough?

 

[Chases7885]

my dad said that he didn't want to push the engine over the 1500 rpm. I still haven't checked the filters yet, I plan to tinker with it this weekend since its stored at my parents place it takes me a while to check things on it and i'm going to post some pictures this week . I really appreciate all the help you guys are giving.

 

[Akicita]

So, your truck stood still for a year. I presume it was parked outside in the same spot for all that time.

I agree with all the suggestions already made but want to add one more thing to check: When you release the park brake (that lever right by the driver's door, "up" is brake applied, "down" is brake released), are the wheels really free or are the brakes so rusty that the brake is still "on" even when you think it's not?

Also, keep in mind, that you get the best performance from diesel and not from any of the cheaper alternate fuels and fuel mixes.

Good luck!

 

[cattlerepairman]

Also check air filter for critters.

 

[Chases7885]

I bought it a year ago and before I got it it sat for 4 yrs. I'm pretty sure the break releases I just redid all the break system when I got it then it sat thru the winter. I only ever run clean diesel fuel in it I'm going to change all the filters and see if that might fix the problem this weekend

 

[Chases7885]

transfer case in low??

so we got it figured out the transfer case was in low my dad was reading the metal label wrong. there's that 6th grade education for ya lol

 

[dmetalmiki]

Glad you solved the "problem" (dad!)...how about some pictures to show us now.

 

[frank8003]

OK ...................
where is the pictures for the General?

 

[Jeepsinker]

I was going to say, 1500 rpm isn't enough rpm to get anywhere anyway.