Diesel 5 speed??

Gold TX Sleeper · backyard mechanic Joined: 05 Feb 2002 Posts: 509

I read a post in the parts section from a certain newly banned member about a diesel 5 speed. Apparently they are different from the petrol versions. Can anyone enlighten me on what the dealio is with these boxes ? is it just different ratios or a little more complex than that ? If it is the ratio's, can anyone please supply me them for this box ? And why someone would want to fit it.
Cheers,
Jasyn...

Corty · tinkerer Joined: 01 Nov 2001 Posts: 126

Early 4spd Late 4spd 5spd Petrol 5spd Diesel
1st : 3.51 3.79 3.79 3.48

2nd : 2.18 2.18 2.18 1.99

3rd : 1.42 1.42 1.42 1.36

4th : 1.00 1.00 1.00 1.00

5th : n/a n/a 0.86 0.86

Its just a ratio difference i don't believe there any better or stronger than a stanard petrol boxs. the reason for use is in for instance a rally car you want closer ratios and also seeing u drive more in 2/3 gear u want the acceleration and punch out of the corners

Matt

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

Also the diesel box has a cast iron center plate which is considerably stronger than the petrol 5spd, and the later petrol and diesel 5pds have bigger bearings,

cheers
Eggy

Hamal · tinkerer Joined: 14 Dec 2001 Posts: 64

Hrrm.. so the diesel fits fine, just closer ratio's (which mean more torque, lower speed).

And a little tougher to boot?

I'm no speed demon, especially on the roads, so a bit of low down power for take off's would suit me just fine.

Is there any real reason why I shouldn't go the Diesel 5 speed?

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

Gold TX Sleeper · backyard mechanic Joined: 05 Feb 2002 Posts: 509

Thanks for clearing that up for me - it's appreciated.
Cheers,
Jasyn...

Racegem · backyard mechanic Joined: 30 Jan 2002 Posts: 987

Can anyone say for sure that they bolt to the petrol motor, ie; "Yes I have one in my car"?? Another source told me they didn't fit.

Yonnee.

Doe · rice boy Joined: 14 Mar 2002 Posts: 14

bolt straight in.

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

Again, Yes they will bolt straight into any manual gem from TC to TG but you may need the fine spline tailshaft, other variant's of the box are used in rodeo and shuttle and jackaroo and may have the starter on the other side like certain piazza 5 speeds, as far as I know, I bought a Diesel 5spd had it reco'd and it fitted straight in.

Cheers
Eggy

Racegem · backyard mechanic Joined: 30 Jan 2002 Posts: 987

Thanks guys, good to know. Surprised

)

Yonnee.

Badger · tinkerer Joined: 13 Feb 2002 Posts: 155

if the ratios that you have posted are correct, then the ratios in the diesel box are longer NOT shorter, this means less torque and less acceleration in those gears, however, they are closer ratios.

this would be because the diesel engine has more torque that the petrol, but doesn't rev as much. you would get better accel from the petrol box (if you have a flat torque curve).

the diesel box would be good for highly worked engines with narrow power bands, but you would also want a shorter diff ratio (4.1/4.4 would be nice but where do you find one????)

Slug · tinkerer Joined: 06 Oct 2001 Posts: 196

Glad to see not everyone is asleep .... Michael

Josh · backyard mechanic Joined: 04 Oct 2001 Posts: 602

eggy, how much was it to get it recond???
what did the recon include?

GasGem · backyard mechanic Joined: 05 Nov 2001 Posts: 755

all up supply Diesel box new h/duty bearings, hand lapping for syncro's, replace synchro's on 2 & 3,
I supplied a second box for selection of best gear sets
all up $700.00

Cheers
Eggy