3.03 gearbox extension housing length

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xctasy
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3.03 gearbox extension housing length

Post #1 by xctasy » Sun Mar 05, 2017 8:07 pm

I don't have one, but the 1966 to 1973 9 bolt 3 speed Toploader extension housings used on our 3.03 gearboxes...are they 14, 15.5 or 17" long?


Its the same as the AMC Hornets and Gremlins with 150-T.


Is it basically interchangabe with the 4 speed TopLoader?
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XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
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vssman
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Re: 3.03 gearbox extension housing length

Post #2 by vssman » Thu Mar 09, 2017 12:03 pm

I have a 3.03 sitting in my basement and can get the measurement for you. I just have to remember to do it. If you haven't heard back from me, send me a PM
63 Falcon 'vert running a 68 200CID Tri carb and a few other goodies

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Re: 3.03 gearbox extension housing length

Post #3 by xctasy » Fri Mar 10, 2017 12:33 am

No worries. Don't get lost....I'm not used to getting info right away...its kinda hard to find the info on the net, everyone talks 4 speeds, but the little 3.03 is more plentifull than all the others.... :thumbup:
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

vssman
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Location: CT

Re: 3.03 gearbox extension housing length

Post #4 by vssman » Fri Mar 10, 2017 4:53 pm

From the face of the transmission case to the rear of the face where the seal is installed is 14 3/4" on mine. Photos are available if needed. If you feel like visiting cold Connecticut, I have one in my basement for you... :lol:
63 Falcon 'vert running a 68 200CID Tri carb and a few other goodies

vssman
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Re: 3.03 gearbox extension housing length

Post #5 by vssman » Sat Mar 11, 2017 6:56 am

Photos I PM you posted for anyone else needing this info...

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63 Falcon 'vert running a 68 200CID Tri carb and a few other goodies

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Re: 3.03 gearbox extension housing length

Post #6 by xctasy » Thu Apr 20, 2017 10:33 pm

Thanks.

viewtopic.php?t=41637
jamyers wrote:Here are the 3.03 gear ratios for 6-cylinder models, V8-s had taller ratios.

First 2.99
Second 1.75
Third 1.00
Reverse 3.17

The 3.03 manual is also known as a RAN gearbox, from the casting codes on the side. Best way to id one in the car is by the casting codes.

Edit: Those ratios were in Bronco versions, but I think they were same for Mustangs/Falcons.


I'm looking at a GearVendors overdrive, a 0.78:1 ratio hike on the stock ratios above, to create a quasi TKO 6 speed.

1st Gear: -----------------> 2.99
2nd Gear (OD Ist): -------> 2.33
3rd Gear: (2nd)-----------> 1.75
4th Gear: (OD 2nd)-------> 1.37
5th Gear: (3rd )----------> 1.00
6th Gear: (OD 3rd)-------> 0.78

It doesn't quite do it as a close ratio TKO 6 Speed, as the first three ratios differ by 11.3 to 4 %, but not far off...


close ratio TKO 6 Speed
1st Gear: 2.66;(in terms of the ratios above, 3.33) vs 2.99 11.3 % to steep (taller geared than ideal)
2nd Gear: 1.78;(in terms of the ratios above, 2.22) vs 2.33 5% too shallow (lower geared than ideal)
3rd Gear: 1.30;(in terms of the ratios above, 1.63) vs 1.75 7.4% too shallow (lower geared than ideal)
4th Gear: 1.00;(in terms of the ratios above, 1.25) vs 1.37 9.6% too shallow (lower geared than ideal)
5th Gear: 0.80;(in terms of the ratios above, 1.00) same
6th Gear: 0.63(in terms of the ratios above, 0.79) almost the same
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

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