Close vs wide ratio TKX box

[OzCharger69]

Hi all,

I'm finalising my order from SST to convert my Charger to 5 speed manual from auto. I have a choice between the following ratios

Wide
3.27, 1.98, 1.34, 1.00, 0.72

Close
2.87, 1.89, 1.28, 1.00, 0.68

The motor is a fresh 383 which runs real well and I have 3.91s at the back. The wide ratio would give better hole shot but I'm afraid it would make shifting between gears more jerky. There is a plan to switch to a 440 or 512 so I was leaning towards the close ratio.

I'd love to hear a few opinions.

 

[1 Wild R/T]

Close ratio... Better spread, better O/D ratio...

Your first gear with the close ratio is gonna be so deep it'll be a pretty quick shift as is... If you were running 3.23's the wide ratio would be a good compromise but with you engine & axle close is a better match...

 

[OzCharger69]

Thanks that makes sense. It's more the fact that the engine will change in the future that makes it even more difficult to decide.

 

[joe smith]

Hi all,

I'm finalising my order from SST to convert my Charger to 5 speed manual from auto. I have a choice between the following ratios

Wide
3.27, 1.98, 1.34, 1.00, 0.72

Close
2.87, 1.89, 1.28, 1.00, 0.68

The motor is a fresh 383 which runs real well and I have 3.91s at the back. The wide ratio would give better hole shot but I'm afraid it would make shifting between gears more jerky. There is a plan to switch to a 440 or 512 so I was leaning towards the close ratio.

I'd love to hear a few opinions.

How long a wait for one or do they have them in stock?

 

[OzCharger69]

8-10 weeks

 

[biomedtechguy]

Close ratio for sure, the rear gear and future larger displacement engine seal the deal, but if you only had the 383 with a 3.91 rear gear I'd say the same.
I guess my only possible way I'd suggest the lower 1st gear wide ratio is if you were going to do a LOT of ⅛ mile drag racing.

 

[Nxcoupe]

Close ratio. Focus on the OD, you can always throw more rear gear at it but 3.91 should be plenty with the big block torque. Remember that the 833 4 spds had less first gear ratio.

 

[furious70]

IMO neither works great with a big block with a cam. My 440 even with 4.10's does not like the .68 in my tko until 65-70mph. If you have a mild cam not as much as issue. .72-75 is what I would custom build if I could. But the dump truck granny gear of the wide ratio is also garbage if you have tq.

 

[BMosely]

I am running the close, 3.55, 28” tires and hydraulic clutch. The car drives great. I agree on the .68 over, you could move to a 3.73 or 4.10 for the bottom and really not lose any highway manners. We just got our motor back for round II and installed the motor/tkx from the top yesterday. Have some extra sets of eyeballs on hand as is is very tight and wiggling the headers in sucks.

 

[biomedtechguy]

1st	2.64 : 1
2nd	1.92 : 1
3rd	1.40 : 1
4th	1.00 : 1
5th	0.70 : 1

Those are the gears in my Passon 855 5 speed.
I swapped the factory 3.54 gears to 4.10 in the Dana 60, and dropped 750 RPMs in 5th vs the 3.54s in 4th with the 833.
Makes the drive a lot more fun in every gear!