Please help
I have an old tired th 350 3 speed automatic in my 262 - 1976 Monza with a 2.56 rear end
I am installing a 235 - 250 HP - 305 TPI and I would like a 4 speed auto to finish the update
Everybody want to sell me what they have in stock, rather than the one that is best for me, I afraid.
This is not a big power engine, but with a 4 speed auto, I hope to get the mileage about 25 miles / gallon, a rpm of about 1800 - 1900 doing 110km/h for the motorway, rear tire is 225/60 -15, please advice.
I think a lock up speed of 1750 rpm would be right and some people think that I should shift down to 3rd in city driving or only have a lock up function on when lever is in 4 gear.
I was thinking th200R4 myself, as it has the same size and fits the same length, but everybody wants to sell me 4L60 or 4L60e, but I think that it just because they have it in stock all ready.
I really need advice from somebody that have no gain from recommending either one.
Thanks from Erik