Passon 'hemi' overdrive kit

[SFRT]

I'm thinking on getting..anyone run one? Opinions?

[Tom Q]

I have one in an alum case behind a six pak stroker with 10,000 miles on it.  Road course tested, works great, nothing else compares.

[mopar_nut_440_6]

I talke to Jamie at Passon and then his BC distributor. Both very nice guys. Jamie said he has these behind 800 horse engines and have no problems. I was considering going to a 5 speed but now I am going to  purchase the Passon parts and install them in my tranny. I will be able to run my 4.10 gears and will be able to do 152 at 6000 rpm or 165 at 6500 with a 28 inch tall tire. No cutting of the floorpan required and I will still look stock.

[firefighter3931]

Just curious if this Kit will drop into a 23 spline iron case ? It sure would work nice with a stroker using a wide LSA cam profile resulting in a broad powerband. The shift recovery between gear changes wouldn't be as noticable as with a 440....


Ron

[SFRT]

I currently have an 18 spline and I think 3.55 or 54 gears I am not really sure...so it should not be a problem... but the syncros feel tired and I figure if I am going to rebuild it, might as well...and i would like to change my gears to 4.10 /4.11 and still be ok on the freeway and so on as well. the chart in that carcraft article makes it very enticing...leads to another question..in my Dana 60, if I currently have 3.54...will I need a different carrier for 4.10 or will they fit?also, who makes a decent gearset?

[mopar_nut_440_6]

Here is what I poste din another article after talking with Jamie. You will notice the gear ratios are similar to running a 727 for 1-3 with 4th being the extra gear! I am not sure if he makes a kit for a 23 spline but as I am running a stroker I want the 18 spline for insurance. At the price of the kit I do not want to have to back track! SFRT I have also doen calculations on the 3.54's which become the equivalent of a 2.83 in 4th which will give you more top end than you likely want or need!! 4.10's seem to be perfect!

His kit to convert a 18 spline A833 is $1695.00 USD. Bolt right in no machining required just change the 3-4 shift rod as it will need to be longer! Apparently have these behind engines with up to 900 horse and no failures to date!

The gear ratios are as follows:

2.66
1.59
1.0
0.8

With 4.10's the final ratio in 4th gear is 3.28 and with 3.54's is an awesome 2.83.

If I run a 27560R15 tire which is approximately 28" tall the top speed at a meager 6000 RPM is 152 MPH with 4.10's and 176 MPH with 3.54's!

With 3.54's 6300 RPM = 185 MPH
With 4.10's 6500 RPM = 165 MPH

This seems to be the answer as I can leave my 4.10's in, launch hard on the strip, factory look, do not need to cut the floor pan, cheaper than a 5 speed or OD and still have decent highway speeds and "some" economy! 2400 RPM at 60 MPH  with 4.10's!

[ITSA426]

I just got one and hope to install it behind the 440 this weekend.  The old transmission was getting tired so it seemed a good, logical upgrade.  I wish it was available for a 23 spline.

[WingCharger]

So, this is another option to a GearVendors setup?

[mopar_nut_440_6]

http://www.passonperformance.com/