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I have Suncoast built tranny (triple disc converter, billet input, ect.) in my 99, that I purchased new directly from Suncoast. During normal driving or towing it can't decide if it wants to stay in 3rd or 4th untill I get moving quicker. It only has about 15k on it and I have never had problems before, except occasionally in the morning If I started it up and put in gear right away it would be slow to get get moving (don't know if this is a related problem). It seems to be a little worse every time I drive it.
Tomorrow I plan to take the battery ground's off and clean them up( I doubt this is the problem because the connections look good but I aint sure were else to start). I hope It is not the tranny cause I don't want to remove it again. If so it still has a warranty I hope they will stand behind their work.
Any help is much appreciated because this is my only work truck at the moment and I don' want to keep driving it more than I have to till it is fixed.
1999 NV4500, 4200 lb Sintered iron SB Clutch PPump 5k springs/580 CC S400 turbo/t-6 foot 250 horse injectors Hamilton valve springs, pushrods, 188/220 cam Dana 80
2005 auto, Smarty so6 pod Hamilton 181/210 cam 2nd gen BD manifold 57-65-14 turbo
In my truck's case I have found that there is a direct correlation between the shifting, throttle position, and programmer placement.
Example: If I turn my programmers torque level all the way up then the programmer fuels the truck heavily with very little throttle.... So I find that the transmission reacts by THINKING it can shift, but in all reality it can't quite hold it with such low TV cable pressure.
HOW I FIXED MINE: I run my edge programmer on the lowest setting for throttle response and torque... Therefore to get the truck rolling you must put your foot further into the FUEL PEDAL (increasing line pressure in the transmission)... This stops the early shift and when it finaly does shift into the next gear it stays there.
Try it and let me know what you think... I run my edge juice with attitude on level 3 with the low end responsiveness on the very lowest setting and the tranny loves it!
2001 QC 4x2 47re 3.54, Edge Juice Hot, Airdog, Traction bars, Heavy Transmission mods, ported and oringed head, ARP studs, phatshaft 62,14... Big stick Colt stage 3, Mach 4's. 17" Gen 3 Chrome rims, BD rad,
to answer your part of your question, when you first start your truck and get going right away the reason it is shifting slightly erratically is due to the tranny being cold. It combat this simply let the tranny warm up a bit before heading out. you can do this by putting the truck in gear and holding your foot on the brake same as if you stopped at a light or stop sign. This creates heat in the tranny because it wants to move forward but cant. On the other side of the spectrum if your tranny is running hot throw the truck in neutral when your at lights or stuck in traffic. At roughly 200* your tranny fluid can start to boil and wreck things inside the tranny.
99 Ram 2500: 4" MBRP TBE/8" Mitres, Edge Juice w/ att, ATS A3k,ATS Arc-flow,ATS 3 peice manifold, AEM brute force intake, CCP 225hp injectors,ISSPRO A-pillar gauges, Goerend built tranny,FASS 150, EBC rotors,EBC green stuff pads.
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