Overdrive: When is it necessary

[phantoms]

Re: Overdrive: When is it necessary

Running in O/D doesn't mean that the torque convertor is locked up. It locks and unlocks depending on load, decelaration, braking, etc. When the torque convertor does lock up, the trans actually runs cooler because torque convertor slip (what it's designed to do) is the main generator of heat in a transmission. Having a lock-up trans is even more important in an O/D where the engine operates frequently at lower RPMs such as while cruising. With some gear ratios and a O/D, you may actually be cruising at highway speed still within the stall range of the torque convertor (meaning slip and heat) and the lockup prevents this from happening along with saving gas.

 

[jtexas]

Re: Overdrive: When is it necessary

thanks phantoms, on my ford its a difference of about 500 rpms when it locks or unlocks. I try to stay aware of it when OD is on.

 

[BoatBuoy]

Re: Overdrive: When is it necessary

Pony, this is much ado about nothing. <br /><br />Alumacraft FD-14 = 210 lb.<br />25 hp Johnson = 110 lb.<br />trailer = 200 lb. +/-<br />beer = 50-200 lb.<br />Total = 570-720 (depending on thirst).<br /><br />My lawn mower could pull this in high gear.<br /><br />OD off/on, won't make much difference.

 

[Pony]

Re: Overdrive: When is it necessary

Yup BoatBuoy you are most certainly correct...not heavy at all. I realized that this post became less and less meaningful to my situation as it progressed. nice to learn a lot though. This is a problem in that its easy to forget that the boat is even back there.<br /><br />I would guess with gear etc its more along the 700lb range at the least. Which is still enough weight that I want to avoid the sudden shifting into and out of OD in order to keep down the strain on the tranny. I like I've pretty much decided to keep OD on unless its very hilly etc, and just make sure i take my lead shoes off when i am trailering.<br /><br />A 1/2 barrel or typical us keg weighs 160lbs, or 7 cases, or 15.5 gallons of beer. LOL 200lbs of beer is A LOT of beer for a little alumacraft. I know what you are all thinking, but that sort of info is useful to college students like me.( ever tried to get a keg up 7 flights of stairs......not fun especially in the winter when the staircase is on the outside of the building)...........

 

[javsam]

Re: Overdrive: When is it necessary

yup, listen to grampa, smart man, that packaged is very easy to tow, in fact I pulled the same package with a 1990 cavalier 4cylinder for years. I also changed my own trannie fluid and when I changed at 120000 miles it still was spotless on inside of pan. plus I hadn't had a trannie cooler on either.<br />not too bad.<br />javsam