Yeah, looks like you have one. Well there you go.
Diff gear recommendations
- Thread starter 4spdragtop
- Start date
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More research lol, gone from gears to tc to OD to....??? Lol. Thanks
That's how it's did. Snowball. lol
Here's another thread to glean from.
www.forabodiesonly.com
904 lockup info
I am trying to make a decision on which transmission to swap into my early A body. Ihave a 904 lock up (core) and like the idea of having the bigger clutch pack and other more heavy duty bits and the idea of having an extra "gear" when the converter is locked does have appeal. My questions ...
www.forabodiesonly.com
Steve, remember where they talk about the tunnel being tight and cutting ribs off the transmission to make it fit, they're talking about an early A body, which yours is not. The lockup transmission will bolt into your car. You may have to do something with the drive shaft, I'm not sure.....but big whoop, right?
Thanks Rob, MUCH appreciated and a driveshaft like you said, "big whoop". That was included with the "plans".
roccodart440
Well-Known Member
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Gear Venders Overdrive
It replaces the tailshaft of your transmission. My car didn't require any tunnel mods. They are rated for 2,000hp. You can set them to automatic, or control it manually. The manual option is great because you can also use 2nd gear plus overdrive through town, which for me is better than 3rd gear. I also use 2nd + OD when I race 1/8th mile. https://www.gearvendors.com
If you'd like to see what a vast difference an OD makes for you, check out this calculator and click the GVOD option. Speed/Tire/RPM calculator
Geez, I can't believe you said that out loud
I have LOTS of voices, sometimes I lose track of which ones say what... 
Geez, I can't believe you said that out loud
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My 340 FB FS came with 3:55 gears and they were perfect for all by long highway trips. I turned 13.48 @ 105.38 stock with 29" retread H70-14 tires. Cannot complain with launch but back then there was no 60 foot time measured. I had well over 350 runs on this car all in the mid 13's and never broke anything. So the factory 741 case was strong enough for my 727 but who knows with an 833.
From the content and time of your reply, it is certain you were referring to my previous post. It is possible there is something out of whack in my housing that made gears more prone to whining, even with proper adjustment. The rear end shop tried readjusting the gears (which were originally installed by another well known gear shop), but the whine persisted. Those gears were brand new set from a well known NA supplier (was NOT from Strange). This shop does nothing but rear ends; probably about 4 per day, so that's over 750 per year. The owner said the only gears that are always good come from a Japanese company, but they don't make gears for our cars. He said new NA made gears are hit and miss, and that gears from Strange are usually OK. He suggested putting in a set of OE Spicer gears he had sitting on his back shelf, and the whine went away. He didn't charge me for the Spicer gears.
Well you can think that if you want, but when I reply TO someone, I include their quote. In fact, I didn't even see that post you're referring to and still have not, because yes, I am indeed just that lazy not to scroll back.
Sorry, I forgot to chk notes until now. Wallace Calc's it to be 9.9:1(.030 over 340)
M_Body_Coupe
Active Member
OK, so the cam card calls for 3.91-4.10 gearing...is there a reason why you think that is not a recommendation you should pursue?
I say this b/c it's about the 'combo', right?
Had a hydraulic flat tappet 238/244 @108 LSA in my 360 motor, 4K RPM Dynamic converter and 3.91 gears. Felt pretty good, but it also felt "wanting" more gear. Went to 4.10 gearing, the motor LOVED it!
I am now running a hydraulic roller cam 240/248 @112 LSA but ground 4 deg. advanced, in a W2 408 stroker build, rest of the combo is the same....this thing blows my mind each time I take it out!
Gearing for me was the critical ingredient to get to the right result, as it is not just about the WOT converter flash, but street manners as well, and I need a responsive throttle to make that work.
I say this b/c it's about the 'combo', right?
Had a hydraulic flat tappet 238/244 @108 LSA in my 360 motor, 4K RPM Dynamic converter and 3.91 gears. Felt pretty good, but it also felt "wanting" more gear. Went to 4.10 gearing, the motor LOVED it!
I am now running a hydraulic roller cam 240/248 @112 LSA but ground 4 deg. advanced, in a W2 408 stroker build, rest of the combo is the same....this thing blows my mind each time I take it out!
Gearing for me was the critical ingredient to get to the right result, as it is not just about the WOT converter flash, but street manners as well, and I need a responsive throttle to make that work.
True. As I mentioned I probably over cammed it, but I'll have to live with that. I remember reading cam card when I linked it and saw the recommended gearing. 2nd one I've over cammed. I'm debating how I'm going to tackle this...OD trans...converter...gearing...where's my money gun??
Thanks.
Thanks.
M_Body_Coupe
Active Member
Well, I would say pretty much the standard 'go-to' for dealing with a too large of a cam is to advance it. You could do more than just 2-4 deg...just watch your CR, plug the optional advance numbers into a dynamic CR calculator and stay within the bounds of what your fuel will allow you to run.
Having said that, I would recommend running with at least a 3.91 gear. That motor, even once the converter lets it flash needs to be able to continue to climb the RPMs fast, and gearing is what will get you there.
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