Hard/Late shifts, low power cruising.

[w.lawhorn]

Hi, I just went and test drove a early 99 f250 lariat. When it idled it had a slight lope and sounded like the Rpms were a little too slow. When I was driving it, it shifted way late and head jerking hard in 1st and just as late but a little softer in 2nd. In 3rd it ran up to speed pretty good at 3/4 throttle. When I backed out and it shifted into OD, it would lose speed even on cruise until it downshifted. Then it would slow back down In OD. He said it had a transgo tugger kit in it that the previous owner put in it and it has always ran/shifted like that buy he also doesn't seem very mechanically inclined. I just wanted to see if I could fix it easily as he has a good price on the truck. 8000 for a 4wd 4dr lariat 227k.

[atvrider93]

thats not a great price on a truck where it sounds like the trans might be on its way out

[w.lawhorn]

Originally Posted by atvrider93

thats not a great price on a truck where it sounds like the trans might be on its way out

Lol that's true but I dont think it is, because it doesn't flutter the tach. But that's why I am asking, I'm not a tranny man.

[w.lawhorn]

Anybody have any ideas?

[1Dieselman]

Sounds to me that more than likely there is a engine problem and its not making good power.

[w.lawhorn]

Originally Posted by 1Dieselman

Sounds to me that more than likely there is a engine problem and its not making good power.

OK, any ideas as to what might do it? ICP? EBPV? it seems to have a glow plug problem. Very little blowby. It has a new CPS. I don't have a way to do a buzz test. Small oil leak. He said it was a transgo tugger kit pro install. It just shifts way too hard and too late to be just the shift kit. It feels almost like a manual dumping a stiff clutch, really got some head jerk to it. It doesn't slip at all. Third pull strong then at 60 or so I let off and it shifts to OD and it won't hold speed.

[1Dieselman]

Really need to do a cylinder contribution test. The reason I think that is the lope at idle you speak of and not holding its speed. I'm not as familiar with the 4r100 as I am the E4od. I know that my E4od shifts pretty hard because I had the VB set up to do it. I know the tugger kits can firm up the shifts a bunch but it doesn't sound like it shifts when it is supposed to. I'm thinking the trans needs to be scanned also to check for codes etc.

[w.lawhorn]

OK if the tranny has codes will the ses light come on?

[1Dieselman]

Yea it should. At what speed where you at to back off to get it to go into od? Is the speedometer working correctly?

[w.lawhorn]

Originally Posted by 1Dieselman

Yea it should. At what speed where you at to back off to get it to go into od? Is the speedometer working correctly?

OK no SES light, and I checked to see if somebody knocked it out. It comes on when you first turn the key to run. The speedometer seemed to be accurate I was backing out around 60.