4 speed trans swap

kneeon · Post by **kneeon** » Tue Oct 25, 2011 2:24 pm

i have a 01 3spd and the mpg kinda sucks so i want a 4spd but from what i read i need do a full 03 swap cause the ngc uses only 1 pcm is there anyway around this without me doing a full swap

Post by **occasional demons** » Tue Oct 25, 2011 3:13 pm

You just need the 41te from an '02, and the TCM, plus the engine bay harness to plug the TCM into. No NGC required. Unless you want NGC, plus the extra expense of the engine to make it work...

Not sure how much MPG you will gain tho. Hwy mileage is a possibility, but city, you may not see much.

kneeon · Post by **kneeon** » Tue Oct 25, 2011 4:06 pm

i know its not a big mpg gain but every little bit helps hopefully maybe 3-5mpg.......im not doing a 5 speed swap until next year if anyone was wondering why not

Post by **occasional demons** » Tue Oct 25, 2011 6:48 pm

For one year... you will be basically going back to most of the 31th wiring for the 5 speed. But hey, it's your car/time/money. But I doubt you would recoup the expense in a year. Kind of defeats the fuel savings you may see.

JeffM · Post by **JeffM** » Tue Oct 25, 2011 7:48 pm

occasional demons wrote:For one year... you will be basically going back to most of the 31th wiring for the 5 speed. But hey, it's your car/time/money. But I doubt you would recoup the expense in a year. Kind of defeats the fuel savings you may see.

If you can't swap to a 5 speed for a year, just wait it out. The benefits of switching from the 3-speed to the 4-speed is almost negligible when considering the time and money you'd spend doing the swap twice.

darthroush · Post by **darthroush** » Tue Oct 25, 2011 11:12 pm

Doing a 3-speed to a 4-speed to a 5-speed swap in a year for no good reason is way too much work for the end result IMO. Just wait and do the 5-speed swap. Do it once and get it over with.

kneeon · Post by **kneeon** » Wed Oct 26, 2011 12:49 pm

matter of fact yea you guys are right i mind as well wait i guess but what if it was all for $100 lol then what should i do

Post by **occasional demons** » Wed Oct 26, 2011 2:01 pm

If you like the practice/adventure, go for it. IIRC the axles from the 41te fit the t350, at least one of them, so you will at least have that much. But you will still be doing some rewiring, and wiring back.