[QUOTE]Now as i say, i'm a newbie, fixing my old one is well beyond me... spacing all those gears sounds difficult... Instead i want a perfectly
reconditioned one to whack in... I've searched around lots and then it dawned on me how nice a 5th gear would be...
(i don't like flying for 60/70 miles at a constant 4000/5000 rpm)[/QUOTE]
First off, take a look at this thread...
http://www.tssc.org.uk/messageboard.asp?board=spit...
Don't worry about the specifics too much, but you will find a lot of discussion about recon gearboxes
[QUOTE]So, as i have never driven a car with an Overdrive i'd love to know;
What exactly is it?! ( i warned you i'm a newbie )[/QUOTE]
Basically it's a second, 2 gear gearbox slapped on the end of a normal box. The low (o/d out) gear is 1:1 (i.e. just passes the same input RPM to the
output and does nothing), the high (o/d in) gear is.. something else and results in more turns on the prop shaft for each turn of the gearbox output
shaft, or to put it another way, a slightly higher gear.
They run a lot like an auto box, using the oil pressure of the geabox oil to move the gear. You have an electrical switch to flick, that moves a
solonoid( electronically operated valve, probably spelt wrong!) It only works - or is meant to at least - in 3rd and 4th, so as long as your gearbox
oil isn't low swaps gear more or less instantly.
BTW You DON'T need to use the clutch pedal to change gear (something no-one told me when I was asking!) with the overdrive, in fact if you DO press the
clutch in, gearbox oil pressure drops and it can't do the gear changing bit until you let the clutch up, build up the oil pressure and it can work
again)
[QUOTE]How much will it drop my revs by?[/QUOTE]
About 500 RPM, depending on speed - o/d 3rd gives a much more useable 30MPH (just over 2,000 RPM) than 4th (bit too far under 2,000) in my 1300.
o/d top tends to work out about 2,000@40 2,500@50 3,000@60 3,500@70
Not enough torque in the 1300 to do much but cruse, but you can drop to 4th at the flick of a switch!
[QUOTE]At the moment my spit...;
Mk2 chassis and bonnet,
Mk3 roof, windscreen and a couple of other bits
Mk4 (FH 59xxxx) Engine Block[/QUOTE]
Humm, Not sure if you can fit a 1500, single rail box in a Mk2, but that's what I put in my 1300 Mk4, partly because that's what appeared in a friends
scrap yard and partly because the o/d switch is encorporated into the top of the gear stick. If you have to use a 3-rail box the switch is meant to be
another stalk on the steering column - are the readilly available?
[QUOTE]...runs really quite well (apart from occasional choke/cold start woes[/QUOTE]
It IS pushing 40 years old mate! I have cold starting problems at 30 years old. Car's not that good at it either. ^_^
Sorry for that joke.
[QUOTE], and a distinctly scary floating feeling at high speeds.) and i just wish there wasn't a deafening sound in 2 & 3rd...
Quiller Triumph has a 'kit' the looks right up my street; (a gearbox & overdrive)[/QUOTE]
DEFFINETLY read this thread! -
http://www.tssc.org.uk/messageboard.asp?board=trad...
[QUOTE]Is fitting a new gear box easy?
i assume that you have to take out the engine, and that you can't undo the gearbox and take it out the other way...[/QUOTE]
Nope, it's not THAT hard (in a Mk4/1500, can't imagin 1/2/3 are much different). In a tidy car, remove one of the seats/footwell carpet (skip this in a
scruffy car and just put something over the seat ^_^). Remove the geabox tunnel cover, support the box from below, unbolt and pull out through the car.
Refitting is the revse.
[QUOTE]Or, should i bite the bullet and install a proper 5-speed box, i've seen quite a few kits using Ford Type 9 Boxes...
Anybody done this?
Are the ratios entirely different?
Will it fit my in my Mk2,3,4 car??[/QUOTE]
A lot of hastle compaired to a o/d I'd have thought (just need the o/d box and correct prop shaft). Probably going to mean custom length prop shaft and
re-callibrated speedo as a minimum.
HTH