ah gearbox

Guest · Post by **Guest** » Wed Feb 02, 2005 1:40 pm

iìhave buy an rebuilt ah tranny from scara-b...how to understand the kind of 4 th gear,spiders gears and forks whit out disassembling??

Post by **Marc** » Wed Feb 02, 2005 1:51 pm

X-ray specs?

Seriously, if it's been rebuilt there's no way of knowing for sure what's in there. You can only see so much through the oil-fill hole. If the ratios are stock they'll be 3.80/2.06/1.26/.89 (or .88) and a 4.125 R&P, that much you can confirm by counting turns in each gear.

Bruce2 · Post by **Bruce2** » Wed Feb 02, 2005 2:10 pm

Marc is right, without opening it up there's no way to tell. Did you ask the trans builder?
An AH could be a double side cover trans or a single side cover, each with a different first gear, and different spider gears and side gears.
What is the part number of the intermediate housing? Its the casting that is attached to the front end of the main case. You can read the number from directly under the trans from the front.

Guest · Post by **Guest** » Wed Feb 02, 2005 4:19 pm

...ah 4658249.....can you tell me??

Post by **Marc** » Wed Feb 02, 2005 4:34 pm

That's the trans serial number stamped into the pad - Bruce is looking for the gear carrier (or "intermediate") housing casting number for a clue as to what style of gears and shafts are likely to be in it....something like 113 301 173 IIRC.

Guest · Post by **Guest** » Wed Feb 02, 2005 4:53 pm

113301103..under there is "h"

Bruce2 · Post by **Bruce2** » Wed Feb 02, 2005 11:23 pm

You are looking at the wrong part. Find the part number cast into the part that is bolted to the front of the main case. One I looked at today was 311 103 173.

Guest · Post by **Guest** » Thu Feb 03, 2005 5:33 am

..113301173b...tanks for the help..

Post by **Marc** » Thu Feb 03, 2005 8:31 am

That's the late (c1972) part, isn't it Bruce? So you'd expect the big mainshaft and late gears?

Guest · Post by **Guest** » Thu Feb 03, 2005 11:37 am

big main shaft???what does it mean??tanks....

Bruce2 · Post by **Bruce2** » Thu Feb 03, 2005 1:34 pm

AFIAK, there are at least 3 versions of the late gear carrier. The 311 301 173, an 081 version, and a 200 version.
By process of elimination he has the early type that uses the bolt to retain the pinion roller bearing.
This also means he has the weaker 10 tooth mainshaft, keyed 3-4 shifter hub, and the early type gear sets that require welding in high performance use.

Guest · Post by **Guest** » Thu Feb 03, 2005 4:35 pm

can i understand someting whitout open all the gearbox?

Guest · Post by **Guest** » Thu Feb 03, 2005 4:35 pm

can i understand someting whitout open all the gearbox?

Guest · Post by **Guest** » Thu Feb 03, 2005 4:35 pm

can i understand someting whitout open all the gearbox?

Guest · Post by **Guest** » Thu Feb 03, 2005 4:40 pm

maibe i can send somephotos to understand...