Auto Gearbox Overhaul for E34

[flash]

Originally posted by 5201+Mar 30 2006, 05:55 PM-->QUOTE (5201 @ Mar 30 2006, 05:55 PM)

Originally posted by Faiz@Mar 29 2006, 09:46 PM

 

[5201]

Flash.... u sure u wanna run arrr...??? Can, lets arrange PNDC for a strip drag style race..... then drive into LDP for street style race..... how??

On the GB.... still some teething problem..... now the box sounds rough when gear is engaged, kinda like oil tak cukup, or some parts are rubbing against each other.......

Taking it apart this afternoon again.....

 

[flash]

Originally posted by 5201@Mar 31 2006, 08:42 AM
Flash.... u sure u wanna run arrr...??? Can, lets arrange PNDC for a strip drag style race..... then drive into LDP for street style race..... how??

On the GB.... still some teething problem..... now the box sounds rough when gear is engaged, kinda like oil tak cukup, or some parts are rubbing against each other.......

Taking it apart this afternoon again.....

Sigh, know how you are feeling now.... continue to update us on your GB saga.

 

[5series]

Guys,

Looks like my e34 M20B25 GB is soon to give way now.

Realising it is rather difficult to shift from 1st gear down in the morning. You need to drag the car for quite a long distance & with hi-rev to make it shift down.

However, once it managed to shift down, it has no problem for the whole day drive.

Visited gearbox specialist, ask me to overhaul the entire box whcih cost around RM3k.

Asked them to clean the valvebody & change the oil, but problem is still there but the drive is a bit smooth.

Now, has anybody experience that? Is there any chance for a M20B25 to replace a 5 speed Jatco GB?

Thanks!

 

[albertsew]

Anyone has similar problem of jerky from 1st to 2nd gear , after putting a Jatco gearbox ?

Does anyone tried changing the ratio of the rear axle to a lower ratio ? (or higher ?)

 

[Slowcar]

Hi Albert,

Know a friend with Jatsco 5 speeder on his E34 M50B25 with jerky 1st to 2nd shift. It really bangs into 2nd gear and sometime the even wheelspin abit if road is wet.

It has be doing this for over 1 year but gearbox still alive. His car is much faster than my own E34 M50B25 with original ZF 5HP18 - BUT only in the lower, speeds like 0 to 70kmh. The lower gears appear to have higher ratio ( higher RPM for same speed.)

Duno what diff ratio he is using.
Does anybody know what is diff ratio of 525?

Peter
SG.

 

[XXX]

FYI

 

[longan]

up the thread...
after do some reading.. still cant make a decission .. whether to rebuilt/overhaul my GM gearbox.. or convert to 5 speed...

any more links / site where i can do more read-up / studies regarding this matter..
TQ~!!

 

[Vincent Hor]

Since I have done the Jatco conversion on my E34, this is my observation. My conversion is the complete full works i.e. GB, longshaft, wiring, GB ECU, rear diff 3.91 gear shifter plate & sensors.

Some mechanics don't give you the full works.The rear diff is not replaced. Originally my M50B25 with GM 4 speed comes with a lower diff ratio of 4.10 (525) or it will be 4.45 for 520i

A matching rear diff taken out of a Japan half cut M50B25 would be slightly taller at 3.91

Having a rear diff or 4.10 or 4.45 will give you better acceleration but may lose out on top speed. The engine will also be running at higher RPM. Your fuel consumption on highway drive will also be higher.

Hi Albert,

Know a friend with Jatsco 5 speeder on his E34 M50B25 with jerky 1st to 2nd shift. It really bangs into 2nd gear and sometime the even wheelspin abit if road is wet.

It has be doing this for over 1 year but gearbox still alive. His car is much faster than my own E34 M50B25 with original ZF 5HP18 - BUT only in the lower, speeds like 0 to 70kmh. The lower gears appear to have higher ratio ( higher RPM for same speed.)

Duno what diff ratio he is using.
Does anybody know what is diff ratio of 525?

Peter
SG.

 

[Naim]

does anyone know where to find e34 zf 5hp-18 auto gearboX....mine clutch burn oledi..

 

[macgy]

Anyone has similar problem of jerky from 1st to 2nd gear , after putting a Jatco gearbox ?

Does anyone tried changing the ratio of the rear axle to a lower ratio ? (or higher ?)

Albert, have you solved your problem?

 

[hadzlin24]

goodluck.. in brunei its cost up to RM 5000.. overhoul auto gearbox

 

[beemernut]

I was recently quoted RM3600 From Mpower who seem to do a lot of this work.

 

[maxkpp]

Ha-ha-ha ...argghh!
My ford escape yr 2001 gearbox is gone.
New will be RM48K
Recond is RM18K
Half cut is RM3.8K, no guarantee
Repair will be RM2K +++

So I send for repair, Last Saurday
Next Tuesday will complete. Tomorrow will know the damage$$$

 

[Hammer278]

48K? .....man you could almost get 2 E34s in good condition for that price.

 

[yusriyacob]

i have done some shopping around for the gm 4-speed gearboxes, and this is what i found out. There are several factors in gearbox prices. My choices listed below in order of preference:-

option a: Rebuild own box:
Prices starts from rm3k. Depending on the condition of the gb and the parts required, prices may increase. As the repair kit and tranny oil adds up to almost 1.5k - 2k, 3k seems reasonable for rebuild, if no other parts needed to be changed. 2.5k sounds really really reasonable in albert's case.

Pros: U are assured that the damaged parts are changed and yr box is practically new.
Cons: Cost of rebuild cant be fixed till the box is opened and damaged accessed. Usual damage: Rm3k (if u very very lucky) to rm5k (if u very very unlucky).

Option b: Recon:
This usually means getting it from a gearbox specialist, who rebuilds the boxes for resell. Depends on where u get them, the boxes are usually old boxes rebuilt from other spoilt boxes, or from potong shops.

Pros: Cost is fixed, depending on where u get them from, ranging from rm3.5-rm4.5k, warranty 3-6months.
Cons: U dont know the source or the original damage of the gearbox, as well as how extensive have the repair (or rebuild) work was.

Option c: 2nd hand (aka potong):
This usually means boxes that are taken from (1) cars involved in accidents, (2) half cut imported cars, (3) stolen cars, or any other sources.

Pros: Cost is relatively cheaper than the options above, e34 boxes starts from rm2.5k.
Cons: U really dont know the original source, and worse still, no assurances of the condition of the gearbox u r getting. Meaning the box could die on you on yr way home from the workshop. Also, warranties are usually not given at all.

There u have it, all the options available for gb, with my personal pros and cons. My personal choice, option a. It may be the costliest, as u change the rings, clutch plates and get the soleniods changed too, but the pros outweight the cons, as u r assured of a "new" gb with all damaged parts replaced. This gives me good sleep at night as i dont worry of the gb dying on me the next day.

Some advice for those of u doing up yr gb, tell yr mech to rebuild yr torque converter too. There is a clutch plate in it too, and as u have opened up yr box, the cost to replace the clutch plate in the torque converter is minimal. If u r buying a recond gb, u can try to find out if they did rebuild the torque converter. From experience, rm3.5k buys u a recond gb without work done on the torque converter.

My 2 cents, meant to be info shared. Pls down yr own legwork and decide what is the best for you.

5201.

ermmmmm......very useful view as i had a same problem now in this matter of gearbox...thaks bro

 

[SROK]

For those that have done a conversion to Jatco 5sp GB, could they confirm if there is indeed a jerk when changing from 1st to 2nd gear? A friend just had his 525i GM 4sp GB chnaged to Jatco 5sp GB and there is a jerk from 1st to 2nd gear when the engine is cold. No jerk is felt after car is hot and running? Is this the character of the Jatco GB?

 

[morpheus5039]

I did drive a Jatco without jerk between 1st and 2nd gear before. Btw, for auto g/b i will rather go for Jatco because of the vast availability in chop shop, around 1.5k for the transmission only.

Btw, i got a set complete Jatco with TCU, longshaft, 3.91 open differential from my E34 halfcut leftover, selling for juz 2k for the whole lot.