Does it fit in the tranny tunnel well? No mods? Where did you mount the tranny control module? What type of gas mileage did you notice as an increase with the OD tranny? Does it drop in/out of OD in crusing speed? Did you pick the correct rear gear? can you cruise at 70-75 mph all day long with the 454?
gas mileage? it's a 70 chevelle with full interior
350 (cam unknown, very small) edelbrock performer intake and 600cfm carb. Th350, 3.73 and eaton posi. 235/60-15 tires
Mixed town and highway driving with (octane 95) normal fuel around here. I got 15MPG. The car does have the same 350 (I’m still busy getting the 396 together) but with a 4L80e and 3.55 with eaton posi. 235/60-15 tires again with mixed town and highway driving on octane 95. I get almost 19MPG.
Because of the fuel prices ($6.50 a gallon now, but $9.00 a gallon a month ago) I love my O/D trans.
It turned 3000rpm at 60mph first, but now 2500 with 72mph. I like that. (speed limit is 75mph on the high way in this country) when I drive it 3 hours I am across the whole country
, so all day? I don't no, sorry.
Top speed is 119mph. (That is why I love the German high way, they don't have a speed limit on it)
and still with the old 350 engine with stock exhaust. (this engine turns only 4500rpm max, it does not mather in wich gear)
Some people say you don't need to mod the tunnel, but I needed to make two small dents. one at the underside of the fire-wall, in the middle just where the tunnel starts and one at the end of the tranny. I used the th350 crossmember, turned it around and re-welded the tranny-mount into the middle of the tube. I only needed to drill two new holes for the crossmember. And ofcourse the drive shaft is a bit shorter now (about 1.5 inch)
The module is under the passengers seat and I made a bracket to hold the controller. The bracket fits into the two holes in the metal part inside the ashtray, the controller now fits perfect into the hole of the ashtray when it is open. When I park the car I can take the controller out and everything looks stock.
It goes into 4th gear even at 30mph, but that is because of my Compushift settings. You can program it to lock-up at any speed in 4th gear or 3rd and 4th or not at all. the lock-up goes of at a % of increase or decrease in speed or throttle. You can also shift manual with switches. Do a search on google.com for compushift, I no there is a lot of info about it but I can't find the links in my computer.
The only problem I have is the 1st to 2nd gear shift. When I have more then 1/2 throttle the rear tires squeak for a second when it upshifts. I still can't find out what the problem is.
Hope I helped a bit. Sorry for the long answer.