terry

I have a feeling that counter shaft is a lot looser than you realize, it might be one jumping around making the gears touch. terry

The only way i got the cotter pins in was to bend them in a curve and work them in, it is tough but can be done! Terry

When you get the nut and yoke off you can unbolt the rear cover and put the seal in on the bench, alot easier. when you slide the cover off there are two tapered bearings facing each other with a spacer in the middle, smaller spacers as the bearings wear down to set the preload. At the very most the rear bearing might slide off no problem, just be sure spacer is in there when you reassemble. Terry

That 400 E7 is a good engine, but be real careful of the V-8, parts are getting real scarce and real expensive. Terry

Have had loose exhaust seats do that at an idle or when you let off the throttle, might last a week or 5 years! Terry

If it was a gas job originally it will be pretty slow with a diesel in it if the rears have not ever been changed,also depends if the duplex is a direct or overdrive.Also the gas tranny is a smaller version of the diesel trans. Gas rear ends will be around a 7.00 ratio and a diesel can be mid 4.00 to down to high 5.00's or low 6.00's terry

Just take the 8 1/4 long one and cut it off to the right lenght. terry

The early 12 spd. had 2 sticks with the reverse, direct and overdrive on an air button on the main box stick, the other stick was just a lo-lo and direct box, it has a total of three boxes bolted together, a fairly long tranny. The later ones were the same just the lo-lo was a switch on the dash. It sounds like a complicated tranny but once you get on to it you will love it. When you are empty you can shift the main box all the way to 5th gear then go into overdrive on the air shifter,but if you are loaded then you just use the overdrive button for your upshift splits. first direct first overdrive,second direct second overdrive and so on but once your on to it you will know what gears to skip. terry

I am not sure on the no. of head bolts on which engine, but i do know of taking a thermodyne engine with the same no. of head bolts as the maxidyne, putting the fire ring liners in and scoring the head for the fire ring, and your good to go! terry

If you hear a rush of air then they lock up, it is the footvalve, just changed one on the R model i am driving. I have seen it before, always have been the footvalve. terry

AS far as i'm concerned the 1070 12 speed is the best trany mack has ever made! Terry

I believe to use that kit you have to score the heads for the fire rings. terry

The way i have always done it is to have the splice right in the middle of trunnion bolts, then there is no joint on either side of the trunnion, no flexing on the welds that way. Terry

Have seen alot of macks overhauled and never seen the push rods or injectors put back in the same cylinder. When you get a new injector it is not numbered according to the cylinder, you can ream the injector tube out with a special reamer, put a new washer on injector tip and your good to go. Also the two nuts that hold injector does not torque that tight, don't have the specs. in front of me right now. Terry

They are around the tip on the flat spot on the injector bottom. Terry

The cloth or paper seal is only a dirt/dust shield, there are copper washers that go on the bottom of injector to seal combustion, they are probably stuck in the injector tube, in the head. Terry

The 237/285 horse injector lines will not go on the older style engine, the injector ends are different size. terry

The Quad box in the B422 won't even bolt up to the diesel flywheel housing, with a 9.00 rear even a double over tri plex or quad is not going to get you any road speed,You need a rear with at least a 6.00 or under ratio. Being it was a B68 it had a higher turning gas engine that is why the deeper rearend. Terry

In the early pics of that truck it had the regular B61 hood and radiator, it was probably changed some time in its life to the wider radiator. The B615 model had the bigger radiator,but the same length hood and no fender extensions. Terry

Should be on the right side frame rail, just in front of rear spring hanger of steer axle. Terry

That it is. terry

Be sure to check oil cooler too! Terry

Don't start out to high, you can always come up on your offer, never back down! Iwould start at 3500 or 4000 dollars. Terry

It is hard to use one of them they tend to squeeze down, i mark a circle all way around with a pen. then drill about a 3/16 hole about 2 inches apart all the way around, then cut hole to hole with a hacksaw, i have done alot this way. Terry