5 replies [Last post]
hardchew
hardchew's picture
 Offline
VBMWMO #8733
Joined: 01/24/2014
Posts: 13

I have a spare 4 speed tranny for a 1973 75/5 that locked up on me at about 40 mph and I would like to rebuild or have it rebuilt if its not horribly expensive. I would appreciate any info on someone who could rebuild it or information for a manual to do it myself.
Thanks John K.

schrader7032
schrader7032's picture
 Offline
VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6788
Parts for 4-speeds are either

Parts for 4-speeds are either NLA or very hard to get. Not to mention that there have been shift kit upgrades for the 5-speeds that make them better and less likely to break the pawl spring and leave you in gear with no ability to change.

Fixing it yourself runs into the issues above and knowing what to replace. Shimming the box once complete is very important...takes some good understanding what should be done.

I can think of several people who would could rebuild the transmission - Ted Porter (CA, west coast), Tom Cutter (NJ, east coast), Matt Parkhouse (in Colorado). Bob Clement at Bob's Motorwerks in Montana is probably a good one, too. I'm sure there are others, but those would be at the top of the list.

__________________

Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

Matteo
Matteo's picture
 Offline
VBMWMO #7805
Joined: 04/12/2010
Posts: 171
/5 transmission

I brought my /5 4 speed transmission to Ted Porter a number of years ago for a leaky seal and a rebuild. His recommendation was to get good 5 speed transmission because it is difficult/impossible to get some of the parts for the /5 transmission. I was also given the advise (by someone, can't recall who) to avoid a '74 5 speed transmission. First year of the new design and not as reliable as the later years. Never looked into this in any depth.

Matteo

hardchew
hardchew's picture
 Offline
VBMWMO #8733
Joined: 01/24/2014
Posts: 13
/5 5 speed tranny

I've done a little checking online for 5 speed trannys. They range from $350 (probably toast) to $1100-$1500 rebuilds. I have one 4 spd in the bike that I am now riding and another that needs a rebuild (or a parts donor) I would trade numerous parts from a good donor bike, including Lester 18"wheels , gas tanks, frame , heads, valve train parts, carb parts- etc.. etc.- for a decent 5 speed that will bolt up.
If anyone can give me a lead I would greatly appreciate it. Thanks all

God bless
John

mark_weiss
mark_weiss's picture
 Offline
Arizona
Joined: 11/17/2013
Posts: 173
I'm in Arizona and the shop

I'm in Arizona and the shop where I work does indeed rebuild gearboxes. 5-speed, four speed, /2, all of them.
Yes it is true that some parts are no longer available as new. That goes for /6 five speeds as well. Almost everything is out there though.

It is absolutely impossible to give a quote without looking inside the box. Somewhere between $250 and $1000. It all depends on what failed. If going for a rebuild, not just a "fix it" you can figure about $350 for bearings, $60 for seals, $15 (?) for the gasket. Add to that whatever not-normally-replaced-part(s) need to be replaced. A locked up gearbox usually involves at least one shift fork.

/5 boxes are a bit tricky to set up. This is due to the shift fork adjustments.

If interested: Quality Cycle Service, Mesa, AZ. 480.964.4800

__________________

Mark
qualitycycleservice.com

hardchew
hardchew's picture
 Offline
VBMWMO #8733
Joined: 01/24/2014
Posts: 13
/5 tranny

WELL GUESS WHAT? The trans that I installed last summer from a donor bike just went belly up too! It started making horrible rattling and clunking noises and I nursed it to a neighbors home about 1/4 mile away-got a ride home to get my p/u and trailer. The engine starts and runs fine but the tranny(clutch?) continues to rattle badly even in neutral. Guess I'll give Quality Cycle a call to inquire about making 1 good one from two bad ones, or get a 5 speed. Haven't pulled it apart yet. Too bummed. Guess I will get over it.
God Bless
John

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.