Join Date: Mar 2005
Location: Twin Cities, Minneapolis
From reading your responses, I can't help but think there's some options for you.
I started out with a TKO 600. Went to a Powerglide and later added a GearVendors OD.
The switch from manual to auto was awesome. The addition of OD was icing on the cake.
That said, any your 4th gear should be "close" to what high gear will be like in a non-OD trans. Absolutely you will see some differences between a clutch and a torque converter. But it's "close."
If you like 4th gear, than the C4 is an easy option.
What I'm scratching my head on is your turbo car doesn't like to lug in 5th.
I would address that issue if as you say it is a street car more than a strip car.
IMO, once you address that issue, you will truly enjoy 5th gear.
Mine and a lot of other turbo cars love to be under hard load.
My fear is you install a non-OD auto. Because 4th gear is OK for now. Then fix the breakup when lugging.
Then wish you had OD again.
As with any car upgrades, they seem to never stop!
But we all know it's cheaper to do the job once!
For a street car, I really think OD is the way to go.
Fix the lugging issue, and really see some improvements.
1993 Teal Cobra #2531 1 of 452, 347, Precision 7675, The entire kitchen sink....maybe 2 kitchen sinks at this point!